Shambo most smokers honestly have no idea how bad the smell is to non-smokers.
My family run a pub, I lived there for a while before the smoking ban, now this is obviously an extreme example, but I still have stuff now that still smells of that smoke from 8-ish years ago, and I was only there about three months.
Smoke just seems to 'get into stuff' and the smell can be pretty gnarly to non-smokers, stale and kinda dirty.
Like I said earlier in the thread, personally I've only ever played one smoke-damaged bass, and I could barely stand to be near the thing, let alone have it on my lap with my hands running all over it, it just felt spoiled and soiled. No idea how much smoke it took to get into that state, and for how long, but even so, I can easily see how instruments coming from a 'smoke-free home' could be important to people.