If you guys end up talking about it afterwards, I always use the *just try it & if you don't like it re-gift it* approach. I would just sweet talk him into giving it an honest shot, even for just a day, two, or three, THEN re-evaluate how he feels. Most of us smoked analogs in the beginning also, then the *want* for an analog just went away. Be totally open to helping him whenever he needs it even if his problems don't seem like issues, I sold a kit to a stranger here in town (he's 61 has emphysema and really wanted to give this a shot) he was having some issues with it, so I just told him to come over to my house and I sat down with him and showed him the best *fail safe* methods I know. I could tell it was a little over whelming, but he started it thinking it wasn't going to work and has really been liking it so far. Good luck with your dad. It really is a great thing and if he doesn't like it, the thot is definitely there, we can't convert everyone.