If you're talking about Kaufman's 'Invasion of the Body Snatchers' and smoke not being a good mix, agreed. Abel Ferrera's 'Body Snatchers', on the other hand...whoa, mama.
Also recommended while gettin' a bit organic:
* 'Hardware' and 'Dust Devil'
* 'They Live'
* 'Candyman'
...and I dunno if you guys think it counts in a horror discussion, but I consider it a monster movie, not a superhero flick so 'Hulk' DEFINITELY rates a mention. (And to quote Slater from 'Dazed and Confused', "...and he's green too!")
By the way, Dances with Chainsaws, dug that Jon Stewart 'Half Baked' reference - that's some funny shit.