Some light their pants on fire, while others bare their stomachs before squirting the spray and flicking a lighter, canada.com reported.
The revelation follows the case of a 14-year-old boy who suffered third-degree burns to his stomach when another male student doused him with spray and set him on fire.
"This is a fairly common thing around the province," Middlesex Ontario Provincial Police Constable Doug Graham said.
Const Graham said authorities would be stepping up fire awareness efforts in high schools.
“It’s certainly an issue we have to notify parents about,” Const Graham said.
“We know parents are aware their children are taking the deodorant to school but they’re not aware that they are setting each other on fire.”
