Well, denmarc, if all these good folks with their great suggestions and encouragement haven't yet convinced you, perhaps your first (hopefully not fatal) heart attack will. Or, perhaps one morning you'll wake up with a terrible case of smoker's bronchitis, and you can't breath. Every step you take or every effort you make will leave you gasping for just a tiny bit of fresh air. I'd be very surprised if you don't have a bit of that going on right now. AND it will only get worse, the longer you smoke. Those lungs have a finite capacity, and when they are filled up with smoke, tar, nicotine, there's very little space left for fresh air. Keep that thought in your head while still rebelliously fighting it.
Daisy