Just a thought:
I'm a heavy smoker, and I smoke in my apartment every day. So I'm curious, might the smoke affect the fish I keep in any way? I imagine it might dirty up the tanks, but I don't usually smoke around the bettas.
That's probably true. The smoke doesn't reach the fish room really, but just as a precaution I may start doing that. After all they have tiny little respiratory systems and probably can't handle smoke like people can.