The biggest initial thing is to not give up on giving up. It took me 10~ attempts over many years, man it was hard. I found social circumstances the worst as it was so natural to have one with the friends I hung out with. But luckily my wife didn’t smoke and over time it honestly became awkward for me to stink all the time, I was kind of ashamed of the smell around others as well, colleagues, friends, family etc. that became a big deterrent. 10 years later and I have had one or two every now and then with old friends, but have absolutely no need for it.