Holland has never actually legalized cannabis — the Dutch simply don't enforce their laws against the shops. The correct answer is Portugal, which in 2001 became the first European country to officially abolish all criminal penalties for personal possession of drugs, including marijuana, cocaine, heroin and methamphetamine.
Drugs in Portugal: Did Decriminalization Work?
Compared to the European Union and the U.S., Portugal's drug use numbers are impressive. Following decriminalization, Portugal had the lowest rate of lifetime marijuana use in people over 15 in the E.U.: 10%. The most comparable figure in America is in people over 12: 39.8%. Proportionally, more Americans have used cocaine than Portuguese have used marijuana.
The Cato paper reports that between 2001 and 2006 in Portugal, rates of lifetime use of any illegal drug among seventh through ninth graders fell from 14.1% to 10.6%; drug use in older teens also declined. Lifetime heroin use among 16-to-18-year-olds fell from 2.5% to 1.8% (although there was a slight increase in marijuana use in that age group). New HIV infections in drug users fell by 17% between 1999 and 2003, and deaths related to heroin and similar drugs were cut by more than half.
The Cato paper reports that between 2001 and 2006 in Portugal, rates of lifetime use of any illegal drug among seventh through ninth graders fell from 14.1% to 10.6%; drug use in older teens also declined. Lifetime heroin use among 16-to-18-year-olds fell from 2.5% to 1.8% (although there was a slight increase in marijuana use in that age group). New HIV infections in drug users fell by 17% between 1999 and 2003, and deaths related to heroin and similar drugs were cut by more than half.