For instance, smelling most perfumes or colognes gives me an instant headache but those aren't banned.
Smoking wasn't banned from entrances because of the smell - it was because of the proven harm from second-hand smoke.
It's a nuisance that ruins an atmosphere. To be fair, the police and businesses should be working together to ticket these people at the very least. But it isn't being done so I guess my post is just impotent rage at something that society needs to solve. Sucks though.
And yeah, some strains carry stronger than otherwise - but as a former smoker, the weed smell goes away a LOT faster than cig smoke.