The BBC tells me:
A tobacco smoking ban has come into effect in cafes, bars and restaurants in the Netherlands today.

The country is following a growing trend across Europe and the world of bans on smoking in public places.

Pro-smoking lobbyists say the ban will lead to a drop in business, but others say any losses will be made up by non-smokers going out more.

Patrons of cannabis cafes will still be allowed to smoke marijuana as long as it is not mixed with tobacco.