I support the RElegalization of Marijuana, and I think it IS a gateway drug, which is all the more reason for it to be legalized.
Let me rephrase that.. It has the POTENTIAL to be a gateway drug, and that is based purely on its illegal status. The Illegal nature is what makes it a gateway drug. Once you have gotten over the illegal nature of pot, the illegal nature of cocaine, heroine, X, Acid, etc does not seem like that big of a deal. However pot does not motivate you to want to seek out those experiences. Hell, Pot rarely if ever motivates anyone, anywhere, to do anything.
With such, acceptance of Pot does make it easier to migrate to other more dangerous drugs in that respect, and that respect alone. So removing its illegal status will eliminate it as a gateway drug all together. Pot by itself is about as much of a gateway drug as alcohol is.So making it legal is the only logical way to block any sort of gateway attached to Pot. On a scale of 1-10 with pot being illegal, the likelihood of it being a gateway drug is roughly about 6 at most. Make it legal and that likelihood drops to about 2-3, right around the same area as alchol.
Just relegalize it already. There has been infinitely more damage done by making it illegal than there ever was from it being legal. The levels of crime generated from it have skyrocketed,as crime related to pot before it was illegal was practically non existent. It helps perpetuate drug cartels who will push other drugs along with it. Its illegal status has rendered medical and industrial research implausible.
TLDR: There is no good reason it should not be RE-legalized. The only thing that makes pot a gateway drug is its Illegal status. Remove that, and it is no longer a threat.