This never happened back in the day when hockey was purely an outdoor sport.  As many as two dozen members of the Curry College hockey team from Massachusetts have been hospitalized for nitrous dioxide poisoning.
Officials believe the poisoning was caused by fumes from a Zamboni machine used to prepare the ice during a hockey [...]

Look, if you’re going to cheat, make sure you actually know how to do it – especially if it involves a medical procedure.  This is the problem Italian cyclist Riccardo Rico ran into when he engaged in a blood doping scheme before the 5-day long Tour of the Mediterranean race.  According to the Huffington Post:
The [...]