I’ve noticed that smoke tends to be really obnoxiously persistent indoors… but I don’t think I’ve found any of it to be bugged smoke (safe?); mostly, it seems to be real smoke (ie: horribly toxic and life-threatening). Part of the bug is probably the tile-updating mechanics (which continue to be wonky); just like fire, if smoke is present in an area, it’ll continue to be there until you return to the area, which is inconvenient for in-building smoke, since it tends to like filling a building and then staying there until you personally enter the place to air it out. Don’t think there’s really a fix for that short of a complete rewrite of the tile update system… which is probably in the pipes, given the addition of farming.
Related: smoke is improbably dangerous to the unprotected. I’ve lost more than half my health to smoke-related coughing before, after fighting smokers (and I usually roll with 14 strength, so these aren’t weakling asthmatics or anything). I get that the ‘right’ answer is probably ‘you should get protection’, but sometimes, the right items just don’t seem to spawn; it’d be nice if there were more options available, both for dealing with smoke, and with the aftereffects of breathing it.