Before I stopped smoking, I switched to American Spirits. They have no added chemicals. I quit with no withdrawal. I never smoked again. That was over 15 years ago.
My advice to my clients who smoke is:
You are not addicted to nicotine. You are addicted to the drug chemicals manufacturers add to addict you to their brand. Buy American Spirits. Cut the filter in half so it draws well. Alternate 2 of your current brand with 1 American Spirit for a week and then every other cigarette, then 2 American Spirits and 1 chemical cigarette until only American Spirits are smoked. One naturally smokes less. Even if you don't quit, you will feel and smell better. If you do quit, you won't have withdrawal.