There are, however, some areas of Lisbon and Porto that you might want to avoid, like in any big city, especially at night.
On July 1, 2001, a nationwide law in Portugal took effect that decriminalized the recreational use of drugs.
Many are under 18 and take advantage of the non-harsh laws on minors.
If you try to run them down, a fight may be necessary to get your items back.
In the past, most of these ads were placed by foreign prostitutes who acted in big cities like Lisbon and Porto, today most advertisers are portuguese women living in smaller towns from north to south.
Portugal is a safe country to visit, and some basic common sense will go a long way.
Wear a money belt or keep your documents and money in an inside pocket.