Here is Newsweek's list of countries where marijuana can be used with little hassle.
1. The Netherlands The Dutch consider marijuana as a 'soft' drug. The government regulates cannabis by allowing individual municipalities to decide how many marijuana retailers they will tolerate by issuing licenses.
2. Portugal Drug use and possession were decriminalized in 2001. While drug use and possession is not legal, offenders are not punished like robbers.
3. Peru It is legal to own eight grams (0.28 oz) of marijuana for personal use.
4. Argentina In 2009, the Supreme Court decriminalized use and possession of marijuana.
5. Uruguay Never criminalized marijuana for personal use.
6. Mexico Personal use of less than five grams (0.18 oz) of marijuana is okay.
7. Belgium Decriminalized marijuana but owning a small amount will cost you US$104 (about €75).
8. Luxembourg mandates a fine of US$346 (€250) for possessing small amounts of marijuana.
9. Spain will fine you US$415 (€300).
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