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Tobacco Smoking Impacts Teenagers' Brains

By MedImaging International staff writers
Posted on 18 Mar 2011
A brain imaging study's findings have shown that teenagers who smoke tobacco have less activity in their prefrontal cortex.

Whereas studies have tied cigarette smoking to deficits in attention and memory in adults, University of California, Los Angeles (UCLA; USA) researchers sought to compare brain function in adolescent smokers and nonsmokers, with a focus on the prefrontal cortex, the area that is still developing structurally and functionally in adolescents. They found a disconcerting correlation: The greater a teen's addiction to nicotine, the less active the prefrontal cortex was, suggesting that smoking can affect brain function.

The study's findings were published in the March 2011 online edition of the journal Neuropsychopharmacology. This discovery is clearly not good news for smokers, according to the study's senior author, Dr. Edythe London, a professor of psychiatry at the Semel Institute for Neuroscience and Human Behavior at UCLA. "As the prefrontal cortex continues to develop during the critical period of adolescence, smoking may influence the trajectory of brain development and affect the function of the prefrontal cortex,” Dr. London said.

In the study, 25 smokers and 25 nonsmokers between the ages of 15 to 21 were asked to perform a test that activated the prefrontal cortex and required them to suppress responding. The test, called the Stop-Signal Task (SST), was performed while the participants were undergoing functional magnetic resonance imaging (fMRI) scanning. The Stop-Signal Task involves pressing a button as rapidly as possible every time a lighted arrow appears--unless an auditory tone is played, in which case the participant must prevent himself from pressing the button. It is a test of a person's ability to inhibit an action.

Before the fMRI scan, the researchers used the heaviness of smoking index (HSI) to measure the level of nicotine dependence in the smoking group. The HSI takes into account how many cigarettes a teen smokes in a day and how soon after waking he or she takes the first smoke.
The results of the tests, according to Dr. London, were interesting--and surprising. Among smokers, the researchers found that the higher the HSI the lesser the activity in the prefrontal cortex. Nonetheless, in spite these lower levels of activation, the smoking group and the nonsmoking group performed about the same with respect to inhibition on the Stop-Signal Task.

"The finding that there was little difference on the Stop-Signal Task between smokers and non-smokers was a surprise," said Dr. London, who is also a professor of molecular and medical pharmacology at the David Geffen School of Medicine at UCLA and a member of the UCLA Brain Research Institute. "That suggested to us that the motor response of smokers may be maintained through some kind of compensation from other brain areas.”

Protracted development of the prefrontal cortex has been implicated as a cause of poor decision-making in teens, Dr. London reported, caused by immature cognitive control during adolescence. "Such an effect can influence the ability of youth to make rational decisions regarding their well-being, and that includes the decision to stop smoking,” she said.
The major finding, Dr. London noted, is that "as the prefrontal cortex continues to develop during the critical period of adolescence, smoking may influence the trajectory of brain development, affecting the function of the prefrontal cortex. In turn, if the prefrontal cortex is negatively impacted, a teen may be more likely to start smoking and to keep smoking--instead of making the decision that would favor a healthier life.”

Conversely, the point that adolescent smokers and nonsmokers performed equally well during a response-inhibition test suggests that early interventions during the teenage years may prevent the transition from a teen smoking an occasional cigarette in response to peer pressure to addiction in later adolescence.

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89 (36.001205444336): SELECT id,name,title FROM jos_deeppockets WHERE cat=10 AND TYPE='file_folder' AND published=1 AND id != 294743300 AND id != 294743301 AND id != 294743302 AND id != 294743303 AND id != 294743304 AND id != 294743305 AND id != 294743306 AND id != 294743307 AND id != 294743308 AND id != 294743309 AND id != 294743310 AND metakey != 'aacc' ORDER BY `ordering`
90 (76.055526733398): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (36.954879760742): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (41.961669921875): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (31.948089599609): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (30.040740966797): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (34.093856811523): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (33.140182495117): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (31.948089599609): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (31.948089599609): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (35.04753112793): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (29.087066650391): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (77.962875366211): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733897 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733897 AND published='1' LIMIT 1
105 (42.915344238281): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733897 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733897 AND published='1' LIMIT 1
106 (54.121017456055): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294733897 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (62.942504882812): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294733897 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (87.976455688477): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733897 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733897 AND published='1' LIMIT 1
109 (53.882598876953): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733897 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733897 AND published='1' LIMIT 1
110 (58.174133300781): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.id=294733897 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (603.91426086426): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.id=294733897 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (619.88830566406): SELECT dp.name, dp.id, dp2.name as channel, ex.name as author_name, ex.specialization, ex.images FROM jos_deeppockets as dp LEFT JOIN jos_experts as ex ON ex.id = dp.author LEFT JOIN jos_deeppockets as dp2 ON dp2.id = dp.fid WHERE dp.author != 0 AND dp.cat = 10 AND dp.published = 1 AND ( (dp.fid = 294743300) OR (dp.fid = 294743301) OR (dp.fid = 294743302) OR (dp.fid = 294743303) OR (dp.fid = 294743304) OR (dp.fid = 294743305) OR (dp.fid = 294743306) OR (dp.fid = 294743307) OR (dp.fid = 294743308) OR (dp.fid = 294743309) OR (dp.fid = 294743310) ) ORDER BY RAND() LIMIT 1
113 (338.79280090332): SELECT dp.name, dp.id, dp2.name as channel, ex.name as author_name, ex.specialization, ex.images FROM jos_deeppockets as dp LEFT JOIN jos_experts as ex ON ex.id = dp.author LEFT JOIN jos_deeppockets as dp2 ON dp2.id = dp.fid WHERE dp.author != 0 AND dp.cat = 10 AND dp.published = 1 AND ( (dp.fid = 294743300) OR (dp.fid = 294743301) OR (dp.fid = 294743302) OR (dp.fid = 294743303) OR (dp.fid = 294743304) OR (dp.fid = 294743305) OR (dp.fid = 294743306) OR (dp.fid = 294743307) OR (dp.fid = 294743308) OR (dp.fid = 294743309) OR (dp.fid = 294743310) ) ORDER BY RAND() LIMIT 1
114 (90.837478637695): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733897 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733897 AND published='1' LIMIT 1
115 (62.942504882812): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733897 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733897 AND published='1' LIMIT 1
116 (86.069107055664): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733897 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733897 AND published='1' LIMIT 1
117 (48.160552978516): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733897 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733897 AND published='1' LIMIT 1
118 (56.982040405273): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733897 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733897 AND published='1' LIMIT 1
119 (47.922134399414): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733897 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733897 AND published='1' LIMIT 1
120 (46.968460083008): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733897 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733897 AND published='1' LIMIT 1
121 (43.153762817383): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733897 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733897 AND published='1' LIMIT 1
122 (239.84909057617): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 46569.108963013): SELECT * FROM jos_deeppockets WHERE jos_deeppockets.cat = 10 AND jos_deeppockets.type = 'deeppockets_item' AND jos_deeppockets.published = 1 AND jos_deeppockets.created + INTERVAL 14 DAY >= NOW() ORDER BY jos_deeppockets.hits DESC LIMIT 7
124 (!!!!! 3691.1964416504): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294733897 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294733897 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 17361.879348755): ( SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.video != '' AND dp.video_source != '' AND dp.cat = 10 AND dp.published = 1 AND dp.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) UNION ( SELECT dpa.id, dpa.name, dpa.title, dpa.video, dpa.video_source, dpa.created FROM jos_deeppockets_archive AS dpa WHERE dpa.video != '' AND dpa.video_source != '' AND dpa.cat = 10 AND dpa.published = 1 AND dpa.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) ORDER BY created DESC LIMIT 3
126 (376.93977355957): ( SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.video != '' AND dp.video_source != '' AND dp.cat = 10 AND dp.published = 1 AND dp.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) UNION ( SELECT dpa.id, dpa.name, dpa.title, dpa.video, dpa.video_source, dpa.created FROM jos_deeppockets_archive AS dpa WHERE dpa.video != '' AND dpa.video_source != '' AND dpa.cat = 10 AND dpa.published = 1 AND dpa.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) ORDER BY created DESC LIMIT 3
127 (406.98051452637): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803337 LIMIT 1
128 (164.03198242188): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803337 LIMIT 1
129 (300.16899108887): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803276 LIMIT 1
130 (482.08236694336): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803276 LIMIT 1
131 (254.86946105957): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets_archive AS dp WHERE dp.id = 294803276 LIMIT 1
132 (96.797943115234): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets_archive AS dp WHERE dp.id = 294803276 LIMIT 1
133 (426.05400085449): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294802958 LIMIT 1
134 (169.99244689941): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294802958 LIMIT 1
135 (457.0484161377): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733897 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (365.01884460449): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733897 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (185.96649169922): SELECT name FROM jos_deeppockets WHERE id=212
138 (55.074691772461): SELECT name FROM jos_deeppockets WHERE id=212
139 (820.87516784668): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (746.9654083252): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (116.82510375977): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733897 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733897 AND published='1' LIMIT 1
142 (73.19450378418): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733897 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733897 AND published='1' LIMIT 1
143 (!!!!! 10834.932327271): TRUNCATE TABLE jos_trademed_module
144 (138.99803161621): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294733897 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (96.08268737793): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294733897 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (749.11117553711): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733897 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (94.175338745117): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733897 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (113.01040649414): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733897 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733897 AND published='1' LIMIT 1
149 (83.92333984375): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733897 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733897 AND published='1' LIMIT 1
150 (!!!!! 1528.0246734619): SELECT jos_item.* FROM jos_item INNER JOIN jos_number ON jos_item.numberID=jos_number.id WHERE 1=1 AND (jos_item.imgMini<>'') AND jos_item.type='L' AND jos_item.numberID= ( SELECT jos_number.id FROM jos_number WHERE jos_number.journalID IN (10) and jos_number.id in (select distinct jos_number.id from jos_number join jos_item on jos_item.numberid=jos_number.id where jos_item.type='P') ORDER BY (CONVERT(SUBSTRING(issue,1,2),SIGNED) + (CONVERT(SUBSTRING(issue,3,2),SIGNED)*100)) DESC LIMIT 0,1 ) ORDER BY RAND() DESC LIMIT 6
151 (94.890594482422): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733897 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733897 AND published='1' LIMIT 1
152 (87.976455688477): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733897 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733897 AND published='1' LIMIT 1
153 (51.975250244141): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294733897 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294733897 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (41.007995605469): select distinct links.* from jos_textlinks links join jos_textlinks_placement placement on links.id=placement.link_id where journal_id=(10) and (channel_id=212 or channel_id is null)
155 (36.954879760742): select distinct links.* from jos_textlinks links join jos_textlinks_placement placement on links.id=placement.link_id where journal_id=(10) and (channel_id=212 or channel_id is null)
156 (50.067901611328): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (97.990036010742): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733897 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733897 AND published='1' LIMIT 1
158 (58.889389038086): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733897 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733897 AND published='1' LIMIT 1
159 (123.97766113281): select jos_twitters.link from jos_twitters where cat=10
160 (46.968460083008): select jos_facebook.link from jos_facebook where cat=10
161 (84.161758422852): select jos_google_plus.link from jos_google_plus where cat=10
162 (43.869018554688): select jos_linkedin.link from jos_linkedin where cat=10
163 (436.06758117676): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
164 (!!!!! 1414.0605926514): insert into jos_banners_delta values (14615,'2025-06-27 11:38:04','216.73.216.249','view'),(14202,'2025-06-27 11:38:04','216.73.216.249','view'),(14203,'2025-06-27 11:38:04','216.73.216.249','view')