Why do you think it is so common for little kids to love to spin and spin until they get super dizzy? They are experimenting with altering their consciousness.
Well, that's quite a leap from saying that human beings are naturally curious about changing their consciousness, which is what I am saying. I'm not sure what you're trying to say.
I'm not sure if you're being serious, but I disagree if you are. Any drug can be the gateway for a person at risk for addiction. I don't have hard data (and I suspect there is none proving weed is the gateway drug, but am happy to be educated) but my guess is that alcohol is the gateway drug for a vast majority of Americans.
Can weed be a person's gateway to harder drugs? Sure. Is it the gateway drug? I don't think so.