I went from pack and a half a day to nothing by using a vape. The key is to not smoke at all when you start vaping imo, cause the lung/throat sensation is different, and cigarettes have different chemicals other than just nicotine that keep you addicted. Quitting vaping by cold turkey was a lot easier than trying to quit smoking cold turkey for me.
If you'd like, I can recommend a modern easy to use vape that helped my friend quit this year, and a cheap ejuice site if you are in NA.
There is also the easy peasy method for smoking, but I've never read that version of the book.