If he wants to quit smoking, I'd just encourage him to keep using the e cig as much as he can, and if he has to smoke, go for it. For so many of us, vaping has won out over cigarettes, but not always within a day or a week. vaping can definitely replace the physical need for nicotine, and the habitual, hand-to-mouth activity. Maybe he'll get more comfortable with the inhale experience of vaping with a little more time. Good luck with it!