Legalise Marijuana

I am not an avid user of marijuana. Now that homosexuality has been made legal in India which has been a punishable offense ever since it came into existence, we need to start to make a move for legalising marijuana too. Well if marijuana has to be banned, cigarettes don't fall any farther infact they have to be banned more than marijuana. Tobacco smoke gives 77% more harm to that of smoking marijuana. Now can anyone give me a really good reason to why marijuana should be banned rather than cigarrettes?