And they're 100% correct in that assumption. They'll (maybe) pay their dues with poor health or a shorter life expectancy, but either way it's not your business unless you;re married to one of them (and even then still maybe not so much).

The argument that such and such behavior by others is somehow impacting on you or costing you (or society) dough has a mirror image. I'm sure that something you do has a societal cost higher than average.

That's life, and if you're going to live in a free -- hopefully and sort of -- you have to accept and tolerate the choices others make, good and not so good, the same way you'd hope they can accept and tolerate yours. I'm not saying we have to accept all choices, some we regulate through law, and this post isn't about that.