Disagree that cigarettes only smell when being lit. The "stale tobacco" and "ashtray" smell sticks to your clothes, your vehicle, your house, basically anywhere where it's consumed. Anyone who smoked and later quit can attest to that, mostly because you go through this period of "Oh my, did I actually smell like that"?

Of course, smoked cannabis is the same. Whatever the smoke touches will leave some sort of residue and it can smell. In my opinion the "stale cannabis" smell is more pleasant than the "stale tobacco" smell, but different people are sensitive to different things.

    > Cigarettes only smell when being lit

I am confused. Second hand smoke smells awful, and cigarettes emit second hand smoke the entire time they are lit. Does this not count?