The Marijuana Debate: Should it ever be legalized?

This is always a Hot topic! Whether is should be legalized for medical purposes or just plain legalized, everyone has an opinion on the subject. Marijuana is considered a gateway drug to many because like most substances there is a tendency for it to be addictive. But you never heard of someone dying from an overdose of Marijuana or going to a party and embrassing themselves . So if alcohol and cigarettes are perfectly  legal why is Marijuana still a debate. What are the real reasons Marijuana isn't legal?