Smoking tobacco is far deadlier and more addictive than nearly all drugs. MDMA, LSD, even cocaine.

Only Heroin and Fetanyl are comfortably both more addictive and more deadly.

You draw the line proportionally to how dangerous it is. The government regulation dangerous decisions is nothing new.

They put fences around cliffs. They ban driving under drug influence. They regulate driving with driving licenses. They force cars sold to meet certain safety standards. They regulate the max radiation that devices are allowed to output. They tax certain foods more than others (such as sugar-heavy foods). They ban certain construction materials (asbestos, lead).

The list is almost endless.