Portugal didn't legalize drug use, we decriminalized it, which is not the same. It's still illegal, you just can't go to jail for using or carrying small amounts. Usually you get a trip to the police station, you're searched for drugs (which are confiscated), and you get a date to go to a meeting with a psychologist, who will usually try to convince you to give them up or, depending on the case, to enroll on a treatment program.