When I was 11, I began regularly smoking cigarettes like many of my classmates. When I was a bit older I began drinking beer when I could get it, then later pretty much any alcohol I could get my hands on. Then, one day in SoCal, a friend says "hey - I got some pot, want to smoke some?" I asked WTF it was. He said it was "like a cigarette that when you smoke it you get drunk".
THAT, Cosmic, is what we mean by being a "gateway drug". Tobacco cigarettes and alcohol were my "gateway drugs" to introduce me to smoking pot. Pot may be one......just like alcohol and tobacco and aspirin and Tylenol and antibiotics etc etc etc, but that statement in its own means jack-diddly-squat. IOW it is meaningless, just a thing to say that reflects your fear of the unknown.
I understand (as usual) that this is a special issue for you and I appreciate your emotional involvement, but you are lacking in science on this topic.
Look, I do not recommend that anyone become dependent on any substance for their happiness. I am Buddhist, but I am practical as well. It would be great if everyone could just live forever healthy and happy without any support from anything or anybody...but that is not how this world works.
Some of us have intractable pain, some of us have severe medical conditions that require intervention in order to enable them to live something resembling a normal life. Some of us just prefer to be drunk or stoned or catatonic. It is NOT our right to dictate to these individuals how to cope with their burden. It must be their choice, and it is especially NOT the governments right to dictate this with "law".
When I first moved to Detroit, Michigan had on the books a law that stated that ONLY a married man and women were allowed to have sex and ONLY in the traditional "missionary position". Trying to tell someone what they are allowed to ingest is logically equivalent to that, and it is none of the governments' dam business.
If you want to shoot heroin in an alley until you die, that is your right. It is not my right to tell you not to do that either, though I may advise you not to for obvious reasons. Some things we have control over and some we do not. THIS is one of those issues that we simply do not have control over.