Why are smokers singled out?

While looking into health care benefits, I keep coming across what amounts to penalties for smokers. Higher costs for smokers is an example. And the questionnaires specifically ask if you smoke and for how long and how much and when you quit if you quit. So I started wondering…why is it only smokers? Why don’t we get even more intrusive? Why don’t we ask about how often a person eats fast food? Why don’t we ask if a person uses condoms during sex? Drug usage? Gang affiliation? Stressors in your life? There are dozens of factors that impact health and life expectancy, yet the only one that is singled out is smoking. Why?