Man, I seem to have a lot to say on this, lol.
Only got a chance to skim the thread so far, so sorry if I'm repeating.
Serious thoughts on MJ as a "gateway drug"
The reason weed is seen as a gateway drug while alcohol, cigs, are not lies in the fact that it is always lumped in with "hard drugs": to some folks, drinking a brew is fine, even a matter of good social manners, but having a toke is the same as shooting up with junkies in a back alley. Your typical gov't stance perpetuates this conception; then, Little Johnny/Julie smokes up with his/her friends, and seeing FEW NEGATIVE CONSEQUENCES from a little bud, assumes the whole "Just Say No" thing is a complete sham, and is less reluctant to trust in warnings to stay away from the harder stuff.
I am undecided on legalization, but I do belive that at the very least the government should take some responsibility in providing us with the truth about the actual effects and consequences of various substances as opposed to labeling them all as "Poison" due to ideological reasons. When people know the facts, they are less likely to make stupid decisions.
All that aside, just like with EQ, moderation is the key word with MJ: in both cases it makes it more enjoyable and gives it greater meaning.
P/E