perhaps your father has a particular reason for being so against you smoking besides the obvious. Maybe he knows someone that has died of lung cancer? Perhaps he's having difficulties with it, aside from thinking it's gross... ie. bad dreams, visions, etc. What I'm getting at, is that you are assuming that his dislike of smoking is that it's simple dissaproval, when he could in fact be very scared about it for whatever reason. Speaking to a counsellor is a good idea.
Cheers and good luck!
1.0 Reverse Okeetee Corn, 0.1 Albino Snow Corn, 1.1 Irian Jaya Carpet Pythons