Medications (including all types of nicotine replacement therapy, bupropion and varenicline) have been shown to help people quit smoking. It has been unclear how much additional benefit is gained from also providing behavioural support, such as counselling or a telephone quitline. Combined results from 38 trials suggests that increasing the amount of behavioural support (in person or via telephone) increases the chances of quitting smoking for the long term by about 10 to 25%. The effect may be a little greater when adding some support compared to no support, and a little smaller when more support is compared to some support. Providing some personal contact is beneficial, and people making a quit attempt with pharmacotherapy will increase their chances of success of they also have access to behavioural support.