I should be more precise: I don't believe that the nicotine addiction is strong enough to avoid going cold turkey. On the contrary, if you believe there is a nicotine addiction at all, you will even amplify the feeling of being dependent on cigarettes. If you can't stop smoking permanently, you'll always have an excuse: "It didn't work because of my biochemistry!". Nicotine is addictive, but that effect is neglibible compared to the psychological effects of smoking.
What is responsible for the difficulty is the mental addiction which causes us to feel that we’re making a sacrifice,
allencarr.com.au
To be honest, I never thought about the physical addiction of nicotine after I read Allen's book. You might say that I ignored scientific facts. But it worked for me that way: after I stopped smoking, I had no withdrawals.