My mother in law is almost 71 y.o. and has been smoking since she was about 10 y.o.(yes, really). She has COPD and asthma, about 2 years ago she got pneumonia and had to take antibiotics for it. That round of antibiotics didn't work so they put her on another round of antibiotics, that didn't work. This went on for some time, then she developed c-diff, that is where all your good bacteria gets killed out. This is a very serious condition especially for older people. She was in excruciating pain, she was bed ridden. My mother in law is a very active person and this was very hard on her. She realized after going through all of that, that she needed to do something. Finally about 3 months ago she discovered an e-cig she actually like and since starting it, she has been smoke free. She still can not take antibiotics and at her age that could be a matter of life and death.
Now, what you can take from that is:
1. Your father needs to understand the risks to his health. Yes, everyone knows smoking is bad but at his age there are some risks he may not be seeing. Help him to see these risks.
2. He really needs to "want" to stop. Help him find a reason.
3. Like many others have said, make him see he doesn't have to stop "cold turkey". A little at a time, one day at a time.
4. Really experiment with different e-cigs and flavors. If he finds one he really likes that may be just what he needs to get rid of the analogs.
5. Be patient. This forum has a lot of members and I'd bet that no 2 stopped smoking the same way. As the saying goes, "to each his own".
Research COPD and other conditions like c-diff, print out things for your father to read, help him to understand that you love him and want him around for a long long time. He needs to find the thing that will give him the push he needs to get healthier and quit the cigs. For me it was my daughter. Even though she is only 11, she knew how bad cigs are and she really really wanted me to quit. Her love for me and her need to have me around for a long time really got me going.
I hope something I have said helps you with your father.
~Susiejo