Willem van Mechelen (professor at the VUmc department of Public and Occupational Health) comments in Het Parool about Groningen city to became the first smoke free city in the Netherlands. Prof. Willem van Mechelen: ''The greatest successes in public health have been achieved by legislation and regulations of smoking bans. Research has shown that people can quit smoking but often fall back into old habits. The pressure of the environment is too high to continue the anti smoking behavior. Therefore, we have to change the environment, this will occur in the smoking free cities.''