Management of deliberate self poisoning in adults in four teaching hospitals: descriptive study.

tine patches (37% between years 1 and 3) and in a study using supportive counselling and nicotine gum for 5 years (40% between years 1 and 5). High relapse rates after 1 year are also common in those not attending for treatment. A large general population survey estimated a relapse rate of 35% from non-validated self reports of the duration of abstinence. Success rates after 1 year or less of follow up substantially overestimate lifelong cessation after a single treatment episode.