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Comparison of success rates

Comparison of success rates across interventions can be difficult because of different definitions of "success" across studies. Robert West and Saul Shiffman, authorities in this field recognized by government health departments in a number of countries, have concluded that, used together, "behavioral support" and "medication" can quadruple the chances that a quit attempt will be successful.

A 2008 systematic review in the European Journal of Cancer Prevention found that group behavioural therapy was the most effective intervention strategy for smoking cessation, followed by bupropion, intensive physician advice, nicotine replacement therapy, individual counselling, telephone counselling, nursing interventions, and tailored self-help interventions; the study did not discuss varenicline.