When working as a smoking cessation adviser on the NHS helpline, we always advised people to set a stop date, and plan for it. It was things like going somewhere smoke free ( much easier nowadays) with a non smoking friend, treating yourself to a nice healthy lunch and dinner, and aiming for ‘ one day at a time’. Perhaps making up a playlist of songs to relax you beforehand, or plan something to occupy your hands. We recommended drinking cold grapefruit juice, and keeping a bottle of mouthwash in the fridge for when you have a ‘ notion’ ( we tended to avoid saying ‘ cravings’). Also, before your stop date, cut out the cig you think you’ll find hardest to resist.
I remember a lady telling me she used the Argos catalogue and travel brochures, put sticky labels on things/trips she fancied, with the price written on them in packets of fags, and she’d look through them when she fancied a fag!