Obesity is different, because eating is a basic need, and the factors in the US behind obesity have more to do with the available food being "poisoned": corn syrup, pressed oil, dyes, and other industrial fillers are added to almost all packaged foods, and social traditions around food preparation are vanishing because they're inconvenient with the modern lifestyle.

If you don't want to be obese, you have to maintain constant self-denial, long-term planning, and a basic scientific understanding of nutrition in the face of your available food supply being hijacked by advertisers and profiteers. For millions of years, the best possible strategy for feeding was "acquire as many calories as possible and make them as tasty as possible", and only in the past 30-40 years has that strategy suddenly started yielding bad results.

I think there is a much stronger need for a huge legal and philosophical intervention into the western food supply than there is into the western nicotine supply.