Many Habitual Cigarette Smokers Become Satisfied with Low Nicotine Cigarettes

Many habitual cigarette smokers become satisfied with low nicotine cigarettes, because

A) smoking depends more on finger habits than it does on nicotine addiction.
B) while they decrease their nicotine consumption, they increase their use of alcohol or other drugs.
C) cells in certain brain areas decrease their activity, thereby diminishing the nicotine craving.
D) they find ways of getting high nicotine from those cigarettes.