How about scented candles?
We don't burn candles where the tank is, but in the living room. Also, the dining room is a cross from the tank, about 10', and we use candles.
I didn't notice anything so far, but if I tell my significant other that she can't use candles, it is not going to be....you know.
Also, a friend of mine has a 240g reef tank in his man cave. He smoke cigars there in regular bases. And, we have a club meeting there once a week where at least 12 guys buff on cigars for 5 hours. No effect whatever. He uses an air ozonator afterward.