Speaking from my own experience here is my method.

1. Start by accepting that you will suffer, but think of the suffering like having a bad cold or the flu. You'll hate it but it will pass.

If you are quite a light smoker (handful per day) I would just quit and ride it out. If things get really bad allow yourself 1 but no more. You'll be surprised how quickly the worst cravings go away after a week.

If you're a heavy smoker take more of a run up to it, as follows.

Put off the first smoke of the day for as long as you can. E.g. if you usually smoke as soon as you get up then hold off until after breakfast. Next Day try for just before lunch, and so on over a week or so. Try to also put a gap between eating and smoking. Once you are down to a few a day then do the cold turkey thing.

The trick is actually not buying more cigarettes. If you have them till probably smoke them. But if not, that barrier helps.

I smoked from about 19yo until I was in my early thirties (about 1 pack per day). I also spent the nights smoking a lot of spliffs as well (that's weed with rolling tobacco). Now I only smoke Weed when I go down to see my friends which is like twice a year. I bring back enough tobacco to make 3 or 4 small roll ups which gets me through the come down over the following week. Then it is done.

Quitting the first time is fuck hard but the cravings pass. Now I find it quite easy because I'm used to doing it.

Good luck. You can do it.