Her: What about her, she's cute.
Me: I don't date smokers.
Her: Why not?
Me: Short answer? Because I don't find the habit appealing.
Her: But, come on, she's pretty and single and...
Me: ... please don't make me give the long answer; it's just going to make me feel like I'm being sanctimonious and you feel like an ass for prodding...
Her: ... no, I want to know.
Me: *sigh* Because I watched my dad die from cancer and my mom die from lung disease and neither of those are remotely pleasant ways to go; they're long and painful wasting processes. So, while I'll be the first to admit nothing's guaranteed in life, I've really no interest in forming a long term intimate relationship with someone who's actively playing chicken with both.