Many addicts stop after several years of sobriety, accounting for fewer smokers at AA meetings.
In countries where a far greater percentage of the population smokes, this is not as useful a clue to addiction. Because there are no accurate self-administered tests for addiction, these assertions can't be proven. Accurate statistics require accurate reporting, a contradiction in terms in the field of addiction. I suggest the odds are also substantially greater in a smoker similarly inflating his ego by yelling, or otherwise becoming visibly agitated in non-driving situations. The idea in identifying addicts is to look for destructive and other ego-inflating behaviors.