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Reduce smoking first. This diminishes the craving. Switch to nicotine vape, this breaks the association with the cigarette. Taper nicotine dose over time, further diminishing the craving. Switch to nicotine lozenges, this breaks the association with inhalation. Taper the dose to zero.

A big part of smoking addiction is the behaviours and habits. Desire to smoke is triggered by familiar settings where it is customary to smoke and it is those settings that one should avoid. You cannot go back to your old routines like drinking in the pub and expect it to be easy. You can find healthy alternatives like joining a sport club, where your increasing lung capacity will motivate you.