Brian, way to go bud! That's awesome....
I'm in the 265# club, gained 40# when i quit the cigarettes a few years ago. I can't do any running or anything that pounds on my knees and ankles, (too much abuse on the soccer field), I must try the swimming though.
Quitting the smokes is a different story. After a few days the physical addiction calms down. The biggest problem, at least for me, was the association of cigarettes with every aspect of my lifestyle. Pick up the phone (light a cigarette), get in the car (light a cigarette), have a beer (light a cigarette), pour a coffee....................well, you get the idea. Change your daily habits and it will be easier.