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It is a complex brain disease characterized by compulsive, at times uncontrollable drug craving, seeking, and use despite devastating consequences - behaviors that stem from drug-induced changes in the brain." Scientists have documented how nicotine physically alters the brain

Surprisingly, our results reveal that groups one might presume to be the least psychologically motivated to look for this information, young adults and smokers, were more likely to say that they had previously looked for this information. More than a quarter of adults (27.5%) reported having looked for information on the different components of tobacco products and tobacco smoke, many of which are known to be poisonous or cause cancer

12mg of tar and 0.8mg of nicotine.

That would actually retard cessation by allowing people to continue to smoke, Glynn concludes