Despite aggressive anti-smoking campaigns, the number of people who haven't been able to quite has flat-lined in recent years. New research suggests that there may be a genetic predisposition to nicotine addiction. Aditi Satti, a professor of medicine and director of the smoking cessation program at Temple University Hospital, says scientists are still trying to pinpoint the gene or genes involved. "I think the combo of finding better medications and educating people, even if doctors just spend five minutes talking with their patients about smoking, will lead to higher quit rates," she said.