If you want to lie in bed all day and not leave your home you can because you don't have to run out to the 7-11 to buy cigs. Don't have to go to the store in the cold and wet because you've just 'run out'. Don't have to stand outside the multiplex figuring out which is the shortest movie. Don't have to stand at the departure gate sucking like heck during the 'last call'. He saves all the money he used to spend on cigarettes and buys himself gifts with it.
Cigarettes are expensive and the money adds up quickly.
Until then I was very much against smoking. Then I met a girl. After a few days I found out that she smoked. I smoked for a couple months and stopped for a while. I started again and smoked for the next 26 years.