Hate to sound like an ass, but if you are on probation, you should stop smoking unless you like jail....
My brother in law is sitting there right now because he could not stop smoking. Most cases here are for preemployment testing, if you are in the legal system, its so simple, stop smoking...you are probably going to fail unless you use synthetic, and they dont watch you.
Excersize makes you sweat and that releases thc in your blood, not what you want to have happen.