His response was, I will do what I want, I enjoy it so I won't stop.
My dad is addicted to smoking as well. His version of "quitting" is to flush all his remaining cigarettes down the toilet, make a public declaration to the family that he's finally done smoking, then go buy more and secretly smoke them behind the garage. He's nearly 80, but his quality of life has seriously deteriorated over the last 10 years. When I look at pictures of him from 10 years ago I can scarcely believe it's the same person. In the last decade he's had multiple heart attacks, a stroke, quintuple bypass surgury, a pacemaker installed, throat cancer with radiation and chemo treatments. Smoking has destroyed his body and his outlook on life, and yet he STILL can't stop.