they must have skipped polling Amsterdam.
Or maybe the Amsterdammers (Amsterdamians?, Amsterdamerung?) were too stoned to fill out the poll.

Actually its well researched and documented that treating drug use as a criminal issue doesn't solve any drug problems. Only by treating it as a health issue can you really address the problem of addiction and real education about the harm of the drugs. People in the states don't discuss the repercussions of drug use because its taboo and illegal.
Clearly you've never been stoned, or you'd realize how stupid you just sounded. And the stoners in the Us had no problem... hell even the crack users and meth users managed to do it.

Just for the hell of it, I pulled up the stats for Amsterdam:
http://www.cedro-uva.org/lib/abraham.licit.pdf

Marajuana rates rose sharply since 1987 to 2001, with 20 to 24 year olds "ever tried it" rising from 38% to 58%. Even 50 to 59 year olds this rate rose from 8% to 32%. The average rate of people who have ever used it is at 38%, but that includes the 12-15 and 60-plus age groups, which use at a much lower rate in Amsterdam than the other groups.

Cocaine "ever tried it" use is pretty high in some age groups in Amsterdam as well, with those living through the 80s (30 to 49 group) having the highest rates, of around 17%. There's much less use in older groups, and younger groups don't seem to use it as much either, but the average "ever tried it" rate is at 10%, which is much higher than the (presumedly accurate) 2% figure stated above in the video for the Netherlands as a whole.

Ectasy is quite popular in the younger crowd instead, with about 15% to 20% of 20 year olds trying it.

It's also important to point out that "ever tried it" metrics, which is what the video was using, is misleading, since ongoing usage rates can decrease (as they apparently have been in America: http://www.ncjrs.gov/htm/chapter2.htm) without affecting that percentage.

Well... not at least until all the hippies die off.

This obviously is just a fast look at the stats, and it is looking specifically at Amsterdam (which is a shithole compared with the rest of the country, no offense to any Dutch here) but it appears as if drug use is rising there, but decreasing in America, which indicates legalization isn't a good idea if you want drug use to decrease.