All drugs are decriminalized there, not just pot. Everything.
http://en.wikipedia.org/wiki/Drug_policy_of_Portugal :
In July 2001 in Portugal a new law maintained the status of illegality for using or possessing any drug for personal use without authorization. The offense was changed from a criminal one, with prison a possible punishment, to an administrative one if the possessing was no more than up to ten days' supply of that substance.[1] This was in line with the de facto Portuguese drug policy before the reform. Drug addicts were then to be aggressively targeted with therapy or community service rather than fines or waivers.[7] Even if there are no criminal penalties, these changes did not legalize drug use in Portugal. Possession has remained prohibited by Portuguese law, and criminal penalties are still applied to drug growers, dealers and traffickers.[8][9]
