Many companies are exploring the issue of adopting measures to deal with involuntary smoking. The most comprehensive policies aim at systematically taking action in all possible directions (informing employees, stipulating specific smoking areas, treatment for quitting smoking...). Many agencies are likewise carrying out initiatives for intervention at companies. This study reviews interventions currently being carried out and their components, based on company studies from different European countries. The main common principles for a smoking prevention policy with the greatest prospects for success are identified. This information can be used as a reference for a European model for policies on smoking at the workplace.