I'm considering the navy to put me through nursing school and to eventually be deployed around the world. Maybe I'll be able to see some crap ya know. I have a couple questions about boot though. I am a smoker. I've smoked since I was 18 with a couple stints off. 6 months here 4 months there. Mostly light cigeretts and now for the past couple years ultra light cigeretts. I'm 29 and for the past year now all I've been doing is gaining weight. I'm 225 now and the heaviest I've ever been. Before, during high school and in college I could run all day. I did a lot of mt. biking and was in fairly good shape. I'm worried now if I went to boot how hard it would be. Could anyone give me an idea of what boot is like and what kind of work I need to put in before I go there?