Would this be a welcomed thread on this forum? Although the vast majority of US airports, of course, have no post-security smoking areas, I have noticed a big difference in how conveniently located the pre-security smoking areas are at different airports. Here are some examples I’m familiar with:

Convenient:
DCA - designated smoking area outside every door on upper level departures, and outside almost every door on lower level baggage claim

RIC - smoking permitted a few feet outside every door on both upper and lower levels. Benches readily available in these areas next to butt receptacles.

Inconvenient:
CLT - designated smoking areas on both levels are only at the far end of the terminal building. No-smoking signs everywhere else.

OKC - smoking areas only on lower level, about 100 feet from the farthest door on each end. No-smoking signs everywhere else (including the entire upper level) but the rule is widely ignored based on the number of cigarette butts I see outside the Delta ticket counter!