It is estimated that 29% of adults in the UK smoke (Office for National Statistics, 2000). Each year smoking kills 120 000 people (13 deaths per hour), making it the single most common preventable cause of death in Britain (Callum, 1998). Around half of all smokers will die prematurely because of their addiction (Peto et al, 1994). Their overall life expectancy is, on average, 8 years less than for non-smokers (Callum, 1998). Smoking also costs the National Health Service (NHS) £1500 million, with around 1000 admissions every day for smoking-related illnesses (Parrott et al, 1998). (However, the UK treasury earns £8 billion in tax on tobacco sold in the UK alone, in addition to the enormous revenue from overseas markets.)