This why I don't bother telling the truth in most cases, or at the very least sugar coat it.
Do I smoke? No. I do smoke cigars occasionally, but it's not worth saying yes to.
Do I drink? A couple times a week. And I'm sure if you averaged it out over a month or year that's true. Sometimes I'll have a beer a night for a week, other times I won't drink for several weeks straight.
But it seems every time you answer "yes" to such questions, it's assumed you have a "problem".