I, a non-smoker, would like to not walk through clouds of smoke.
Some have bans on just diesel engines. Others ban combustion engines during some hours. Some inner-city congestion taxes have been introduced for health reasons.
There's a general trend of trying to "optimize" society to remove all ills, and once you apply that logic, there's no clear stopping point. Once you ban sale of tobacco products, you can use that same logic to ban anything, from Cheetos to skydiving to motorcycles.