All my life I've heard that smoking marijuana leads to using "harder" substances. I can't 100% say that I agree with that statement. I also can't say that I didn't eventually do other drugs. I do know I would have been fine with just smoking pot if I'd never been introduced to other drugs. I know several people that have only smoked marijuana. They have no interest in using other drugs. Why is it that many people still refer to it as being the gateway drug?