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Take him outside, not to the course, and try the "NO!" when you are throwing around.....
I have an 8lb Chiuhuhua Pomeranian mix that decided to chase a wriath, when it started fading it nailed him in the ribs at a high speed. He never chased a disc again, but now he barks and growls when I am driving.
I see a lot of suggestions revolving around using negative reinforcement tactics (saying NO, using vinegar), which are fine to use, however this is only half of the steps I think you might want to take. Don't forget to REWARD for good behavior! When your dog doesn't run after the disc, give him a treat. A lot of canine obedience instructors these days (I was myself years ago) will tell you to completely ignore the bad behavior and reward the good.
I say, if you put vinegar on the disc he just won't like it, and not likely to do it again, thats not negative reinforcement. Although positive reinforcement is good.