Do something physical to distract yourself, like go to the gym, or play a musical instrument, or write a book, etc. anything that draws your mind into something else. Back in the 80s, my Dad quit smoking with a Rubik's Cube, picking it up whenever he had a craving.

Picking up a musical instrument, working on a book chapter, studying a language, etc., all require deep focus and concentration, and will push the temptations from your mind.