The Czech Republic: A "Do-It-Yourself Nation"
Pot smokers in the Czech Republic have the highest grow-your-own rate of any nation, suggesting a less harmful alternative to United States marijuana policies. Drug policy expert Mark Kleiman recommends a policy where growth, use, possession and transfer of marijuana is legal, as long as it is not exchanged for anything of value. This would keep big industries and big dealers alike from producing marijuana by eliminating the profit motive. The goal of such a law would be to prevent marketing.
Longer-term, I'd expect some, probably modest, growth in use due to decreased social stigma and employment risk; how much of that growth in use would be among people who then got into trouble with the drug is harder to guess. Overall, a pretty small price to pay for eliminating a big illicit market and several hundred thousands of arrests for using, and tens of thousands of prison and jail terms for dealing, per year.