Why Are Weeds And Other Hard Drugs Illegal While Cigarette Remains Legal?

Cigarette contains nicotine and methane which obviously kills.
It has led the death of millions globally on annual bases, and unfortunately, even thousands have died as a result of secondhand smoke exposure..that means, even a non-smoker is " liable to die young" when exposed to a smoker. Despite these facts, the cigarette is still legal. Isn't it hypocritical to make weed and other hard drugs illegal while cigarette remains a menace flexing freely in the society?