Smoking remains the leading cause of ill health and mortality, at an estimated cost to the NHS of about £6 billion. Stop Smoking Services (SSSs) in England offer intensive advice and support to smokers motivated to quit, and smokers attending have a higher chance of succeeding in a quit attempt than if they attempted to quit alone. However the proportion of smokers using the SSS has been less than 5%, and the number is falling each year. In the Start2quit trial we developed an intervention to persuade and motivate more smokers to seek, or accept, help to quit.

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