Shambles
Bluelight Crew
Drug use among adolescents (13-15 yrs) and "problematic" users declined
I think this is perhaps the most important figure to bear in mind. If young people are less likely to start taking drugs in the first place that helps drug-related issues across the board. It makes sense that young people could be put off from trying drugs in the first place too. Partially due to the legality argument already made (less romance and thrill associated with acquiring drugs from legal sources than doing all that kewl cloak and daggers stuff and the feeling of being a bit special cos you can score such and such and none of your friends have the contacts and all that kinda stuff - the thrill of naughtiness really does appeal when young especially). In large part I suspect also due to greater education (which I believe is part of the Portuguese approach - it's not just legal drugs without context or support services also being beefed up).
It will be interesting to see how the figures settle and find their own level over the years. I'm pretty sure there is a natural level for those who will opt to take drugs and that that level is not hugely affected by legal status. I don't doubt for a second there are some people for whom legal status is enough of a concern that it prevents them from using even though they may wish to but I suspect that is a very low number compared to the population as a whole. As is currently the case, lots of people will try drugs for lots of reasons, most will probably stop using drugs at some stage for an equally large number of reasons. Even where it mentions usage doubling of certain drugs look at the percentages - ~1% of the population. That's hardly a landslide. Some of those will continue to use, some will lose interest, some will develop problems with use, some never will. All will be better off for having the criminality removed from the equation and the other 90-99% of the population will be better off too in terms of reduction in crime (both acquisitive and violence associated with illegal drug dealing) and of not having their friends and relatives locked up for what is a victimless crime (certainly in the case of possession, more arguably in the case of low-level supply (assuming no violence, of course)).
It's a win:win. I can't see how it could be anything other than a win:win. And I further think that as the changes bed in and drugs start to lose all their previous associations with criminality and the glamour that comes with it (which it does even if often rather misplaced notions of glamour) that drug problems will become less and less of a problem. Will be just another part of life that has certain known risks and rewards associated with it that people can see for themselves and behave accordingly.