Don't just buy him one juice. In my experience, there's a 75% or greater chance that he won't like it. You've got a much better shot at finding something he likes by buying 4 or 5 different ones.
Also, and I've written this many times before, many of us thought we wanted something that "tasted" like a cigarette; yet, I think what we were really looking for was something that simulated the feel and experience of smoking a cigarette even though the taste was not the same or even close. For me, a good Ry4 is that juice. Most of the good ones I've tried are neutral tasting - slightly sweet but no "in your face" flavor - and provide the throat hit that simulated the experience of smoking a cigarette.
And don't forget that many of us have a favorite juice (or several of them) that we stumbled onto by pure, blind luck, which we never thought we would like. For example, I really like 555 tobacco juices because I enjoy the nutty taste. I would have NEVER intentionally tried a nutty tasting juice. Luckily, a 555 was included in a sample pack I bought, and I discovered that I really liked that flavor profile.
Conversely, I have found that I don't care so much for many of the flavors (mainly sweets and bakery flavors) that I thought I would like. You will find a LOT of people in that same boat, so don't assume you know what your dad will ultimately like or dislike.
