Perhaps a more unexpected country on this list, Japan has some pretty unflinching drug laws. Not only is Japanese weed the most expensive in the world at $58.30 a gram, Japan also has a zero-tolerance policy when it comes to marijuana. Japanese drug users can expect up to 5 years jail time for a first offense.
Laws are much stricter for foreigners in Japan. According to the U.S. State Department, you should expect long jail sentences, significant fines, and solitary confinement.
Not only does Japanese law severely punish drug users, but Japanese Immigration will turn you away if you have prior drug convictions. Just ask Paris Hilton.