I have this book and have read it many times. I completely believe in his theories and recommendations. Smoking nothing is the best way, absolutely. Some e-cig smokers even go to no analogs (reg. cigs) and then to not even vaping.
It’s ironic that Mr. Carr died of lung cancer. However, his seminars and his book still holds true. Take the whole addiction thing and turn it backwards. Smokers are trying to get back to the feeling they had when they had never smoked before.