To this question posed in a New England Journal of Medicine article…

Is it fair to penalize smokers even though the highly addictive nature of nicotine makes their behavior less than entirely voluntary?

…Dalrymple quotes another article:

…a randomized, controlled trial involving employees of General Electric showed that a combination of incentives amounting to $750 led to cessation rates three times those achieved through information-only approaches (14.7% vs. 5.0%).