You certainly can't legalize. I think that's why it's fair to say it's a problem that requires a global solution. On the other hand, we can look around the world and see many countries that have decriminalized.
There is a private member's bill. Keith Martin's bill is not very different from Bill C-17 of the previous Liberal government, which would have decriminalized the cultivation and possession of small amounts of marijuana. The idea behind that, particularly the cultivation part of it, is that you basically gave out the message that we don't want an ugly organized criminal activity in marijuana distribution; we are prepared, on the other hand, to make a distinction between marijuana use by consenting adults and the growing of marijuana for personal purposes.
So you could go down that road. I'm sure you know that in the Netherlands you have much lower rates of use among youth, and among all segments of the population, with de facto decriminalization.