So the crux of your argument is that because
you philosophically don't think humans should be relying on euphoric substances, they should therefore be illegal? I can't buy that argument at all. As anyone who's been a member of this forum for a while will know, I don't support relying on on mind-altering substances to make one's life better; in fact, I freely ridicule people who do that, including the average student on my campus. But just because I think it's a waste of time, and even counterproductive, doesn't mean I think the government should step in and overrule people's right to choose -- any more than I think the government should abrogate people's right to choose the equally (perhaps more) foolish and harmful choice to eat fast food.
Your argument also relies on vague notions of harm that might accrue from smoking pot. The problem is there's no research to back up these claims. The major side effect of cannabis consumption is a persistent, sometimes chronic loss of motivation. Well, so what? If through their own indolence, some pot smokers miss out on some opportunities they might otherwise have seized, whose fault is that but their own? I'd argue it's actually a positive for society -- it frees up opportunity slots for those of us who are motivated.
I question how significant this claimed side effect is anyway. I know a number of regular pot smokers who are productive members of the work force in responsible positions. I think it's more related to the probability that people who are drawn to pot tend to be those who already lack motivation. As a female friend of mine who's
incredibly intelligent, motivated, fit, and attractive (and also a regular user of marijuana) says, "I counter that such a side effect [the loss of motivation] is more an amplified personality trait than anything else: I tend to go on baking, cleaning, or exercise sprees when high." Precisely. Does someone get into a fight because they're drunk, or do they get drunk because they want to get into a fight? Drugs don't "make" you do anything; they just give you a convenient excuse for following through with whatever urges you might have.
For a while, it was claimed that smoking "might" increase the risk of lung cancer. That myth was shattered last month when a study was released that showed that chronic pot smokers (defined as those who'd smoked 22,000 times in a lifetime) actually had
lower lung cancer rates than the general population when all relevant factors were accounted for. This study was conducted by an anti-pot crusader, by the way, who was more than a little surprised by his findings. But at the press conference, he persisted in saying, basically, "But, um, I still don't think you should smoke pot."
What distresses me so much about the American political scene is that for all their rhetoric to the contrary, conservatives these days are no more freedom loving than liberals. They just vary in which freedoms they think the government should take away. The irony, of course, is that it was progressives (the old word for "liberal") who championed the illegalization of drugs, but it's conservatives who now stand against legalization. Politics does indeed make for strange bedfellows.
Please show me a single peer-reviewed study that indicates marijuana causes substantive harm. Just one.