Secondhand smoke leaves a smell, dumbshit.
Living with a smoker can leave you with the snell of smoke, even for non-smokers.
For fucks sake, this "smoke doesn't have a smell" thing is easily one of the dumbest things anyone's ever said. I can literally tell the difference between burning materials without looking. Burning toast smells different from burning plastic which smells different from wood. And different kinds of wood smell different from each other when burned, too.