This is from that article on the ohio chemistry site:
Of course, at this point one should go to the top of this page and read the first two lines which has been known for 500 years - dose does matter. Both methyl salicylate and hexanes are relatively safe, but one should try to limit the exposure to each to reduce the ill effects
This is the issue. If there is one person at the track practicing and they use some paragon, then perhaps its not dangerous. But when you get 60 guys in a track leaving cans open for 4 hours, you tend to vent a lot of it into the air. Its the same reason that standing next to an idling car wont kill you, but standing in a garage with 50 idling cars will.
In the end, though, it comes down to the individual track. If everyone at a track decides that they want to go home smelling like they came from a bubblegum factory, thats up to them. Personally, I dont care for the stuff, it just makes everything stink.