A scientific review of current evidence published in the journal Addiction has identified three proven strategies to quit smoking. The most effective methods to overcome nicotine dependence are varenicline, cytisine and nicotine e-cigarettes. These three methods work best when combined with counselling, or other behavioural support.

“For behavioural support, evidence is strongest for counselling and for programmes that reward people for stopping smoking,” the study said.

Bupropion and nicotine replacement therapy are also effective, especially if patches are combined with fast-acting forms like gum. Smoking is a leading cause of preventable disease and death, accounting for more than eight million deaths per year.

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