It is if you care about the future at all. A mild prohibition (don't smoke) causes me very little grief, and I can find other things to make me happy. If I do e

It is if you care about the future at all. A mild prohibition (don't smoke) causes me very little grief, and I can find other things to make me happy. If I do enough bad things for my health, eventually I'll give myself enough chances to "win" the lottery. It's not about just eliminating smoking, it's about being healthier and happier over all time. Knowing that I'm avoiding cancer makes me happy by itself. :P