From the site of the above URL:
THE "GATEWAY EFFECT" MAY BE A MIRAGE: Marijuana is often called a "gateway drug" by supporters of prohibition, who point to statistical "associations" indicating that persons who use marijuana are more likely to eventually try hard drugs than those who never use
I've never understood the importance of even dismissing that argument. Isn't it obvious that if a drug is illegal then it's much more common that you get hold of it from a person who also happens to sell other drugs, like heroin or meth etc.? And also, as we have here in Sweden, use of misinformation (cops who lectured to us in school claimed that marijuana was addicting and a hard drug) is another obvious mistake that probably also is a major cause of many people going through the gateway, because obviously if someone tells you it's the same s**t as heroin and you try it, only to find out it's not at all dangerous, then you may just as well try a shot of that good ol H too, seeing as they're all a bunch of liars, then the risk is higher to be sucked into the evil vortex.
Btw... I read a book that was a study comparison between the drug policies and their effects of the Netherlands and Sweden, both of which were initiated about the same time (at the end of the 60's). Sweden has a strictly - naïvely and irrationally - restrictive attitude called "Zero Tolerance" against anything that could potentially expand consciousness or be harmless fun (yes, as soon as they find out something is used to expand the mind, they're all over it like a couple of starving vultures), because I sure as s**t haven't heard of the use of cannabis in hospitals, but I've personally had morphine or some other opiate injected into my blood stream while hospitalized...
Well, the book was interesting (but I can't remember its title). It showed an alarming increase of heroin abusers and other drug abusers, while of course the Netherlands showed the opposite with every drug abuser except heroin, and they claimed in the book that that was because heroin is usually addictive for life, so it was simply the same addicts who were still alive. In Sweden they died like flies and that's no surprise, because this piece-of-shit country was hard even in coming to the humanitarian decision to have a needle exchange program for heroin users, plus there was a police squad in the 70's (iirc) called the "baseball league", who saw it as their responsibility to bash in the skulls of heroin addicts wherever they could find them (and I can well imagine just how moronic the regular police attitude is toward drug abusers even today, behind the curtain).
Furthermore: We have a prime minister who claims that cannabis is addictive and dangerous; there was a talk show episode about drug addiction where the only intelligent liberal was cut out (about 30 minutes was cut out of the program and the only thing they showed of his informative answers wasn't cut away because it would've looked strange in contrast to the answer of a person opposed to drugs), and the other was a poor bastard from the outskirts of the capital who's equally poor arguments were hacked to pieces of rhetorical morons in the audience who outnumbered him; the once-a-year Cannabis March is never covered in the media, etc. etc...
Well, conclusively - back to the book again - Sweden, according to it, officially held that its drug policy was the best in the world (the two countries are apparently competing about this title) and still today (although nowadays the pressure is so high on legalizing that things may just change after all) have the same restrictive zero tolerance attitude.
I and the book at least give this naïve piece of land that at the start, things were horrible in the drug scene: tons and tons of amphetamine users (which back then was used as a diet cure) circulated it, so of course they had a good reason to react, but to keep at it and ignore the statistics is beyond my comprehension in stupidity.
Sorry if this information is a repetition, because I haven't read through the entire thread and haven't searched for other ones, but just in case anyone would've missed it, the reason marijuana was legislated was because it made mexicans get away with untaxed drug use that eventually spread to white (:-O) people in the US and partly because hemp competed with the forest industry, being cheap and easy to grow, making controlled markets hard to... well, control ... like taxing and stuff.