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http://thebrain.mcgill.ca/flash/a/a_03/a_03_cr/a_03_cr_par/a_03_cr_par_nicotine.html#drogues
http://www.medicinenet.com/nicotine/article.htm
http://library.thinkquest.org/TQ0310171/whypeople.htm
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http://www.umes.edu/atod/abuse/tobacco.htm
http://quitsmoking.about.com/cs/antismoking/a/statistics.htm
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