Depends on how serious you are with it. If you are looking to go to a D1 school and you have to really focus on it, I wouldn't smoke that often.

If you are just doing it for a little competition, then it's really no problem.

I play in a Tennis league, I ball, I cycle, I'm about to join a kickball league. In the meantime, I do alot of workouts in the gym, lots of pylotechnics to improve certain attributes, I run around with a sled with weights to improve my overall conditioning. Weed definitely helps me relax after such intense work-outs, with in turn, helps with performance when playing sports.

It's how you maintain yourself. That's all there is to it.