Someone told me they quit smoking by using prayers
You can search for autogenic training on youtube
repeat to yourself silently in your mind ( or maybe outloud if you do not have verbal thoughts in your head ) my forehead is cool and comfortable
My such and such body part is warm and heavy
You do this changing body parts but keeping the forehead is cool and comfortable line the same
You can then change the command for body parts like numb or hot or cold or whatever you want
When you master this other techniques are easier