How much were smoking daily?
Unless you were smoking like a pack a day you probaly didnt do anything terrible to your lungs.

Quitting is a great first step. I don't have any advice there, but there is plenty out there on the internet.

As for starting your parkour training, others can correct me if they think otherwise, but you might want to quit first, and wait until your body adjusts to not smoking anymore (you're finished with withdraw, etc), and THEN start training.  I'm not sure how well you'd be able to hold up going through withdraw and a lot of serious physical training at the same time.

Not to say you should just lay around. It's never too late to start exercising, but just take it a little easier until you're off the smokes.

Thanks for all the tips.. I'm gonna do the APK warmup every day from now on, and start building up some stamina (i'm from sweden so i dont really know all english words for stuff )... Well, lets see how it goes.. I'll probably not train more than a week or two tho.. I'm too lazy 

Maybe i will post some videos in acouple of years