You're comparing apples and oranges. Cigarettes are physically threatening and booze if abused, can be physically threatening as well and also can become addictive.
The issue with pot is its psychological damage to the user including an almost immediate issue with paranoia and some degree of psychosis. Over a long time of use, it can be psychologically very damaging.
Smoking tobacco and drinking alcolhol lead to more tobacco smoking and alcohol drinking and whatever physical and behavioral baggage comes along with it.
Smoking dope not only has its own undesired effects, it very often leads to use and abuse of other, more deadly drugs.
I am always amazed at the numbers of hypocritical rabid anti-tobacco zealots who avidly promote the legalization of pot.