Most smokers say they want to quit but only a tiny proportion make use of the free service provided by the NHS. This research aims to increase the number of people attending the NHS Specialist Smoking Cessation Services using a two-pronged intervention consisting of a brief personalized tailored letter from the GP offering risk information and an invitation and appointment to attend a 'Come and Try it' taster session to find out more about the services, run by advisors from the local service.