I'm starting to wonder if the original poster is still with us on this thread, but if so I'll give it a go. This very thing also happened to me when I first started vaping, and to be honest, almost caused me to give it up completely. FOR ME the trick was to get the right equipment and the right juice. The cig-a-likes just did not do it for me, however, when I discovered the VV Ego battery with a Viv Nova tank with 18mg Cappuccino flavored Ejuice I knew at that point making the switch was a real possibility. So, my suggestion to you would be to take your dad to a good vape store that allows you to taste juices. Have him try them till he stops and says, oh yeah, I like that. Buy some and if he is a Heavy Smoker get him 24mg. If he is at or less than a pack a day get 18mg. Add the juice to a fresh, good, easy, type of tank or clear-o and put that on a VV ego for him. Adjust the voltage to give him good vapor, taste, and throat hit. All of this is cheap and it it works for him may end up being the best investment you ever made. Just my 2 cents. BTW .. I have no means to believe this is the case with your Father, however, there are some people that like the thought of switching to vaping but truthfully are not ready to commit. These folks, unfortunately, may never really make the switch.