Consumption of marijuana in public places is perfectly legal depending on your jurisdiction. Allowing smoking of marijuana wherever smoking of nicotine is allowed seems “only fair.” Examples in the USA include Oklahoma and New York.

On the other hand. The impairment you are talking about has been shown to affect non regular users more.[0] and to be negligible to regular users.

I wouldn’t want to be driving on the road with someone after they smoked their very first cigarette. I remember what that was like the first time I inhaled. It’s all relative. Marijuana can be less psychoactive than nicotine depending on the person and their tolerances. Just anecdata but people also report some cultivars of marijuana calms nerves while improving focus.

[0] https://norml.org/news/2022/06/16/study-regular-cannabis-con...