Health Canada spokesman Eric Morrissette says vitamin E acetate, a chemical U.S. investigators say may have caused the illnesses, is not allowed in Canadian cannabis vaping products.

The voluntary step comes days after new government research showed that Juul is the top brand among high schoolers who use e-cigarettes and that many prefer mint.

The study found that mint was the most popular flavour among Juul users in 10th and 12th grades and the second-most popular among middle-schoolers.

The allegation comes in a lawsuit filed Tuesday by lawyers representing Siddharth Breja, a one-time finance executive at the e-cigarette maker.

"This is only convenience stores and gas stations, so there's a whole bunch of other ways that brands can find the youth and market to them."

The plaintiffs claim they developed a number of respiratory problems, increased addiction to nicotine, and anxiety.

'Tobacco companies are hooking today's kids with the same tools they used to hook their parents and parents to cigarettes...'

Juul has long pushed its e-cigarettes as an alternative for adults looking to wean themselves off tobacco products.

Surrey Councillor Steven Pettigrew wants the provincial and federal governments to clamp down on vape shops.

Dr. Schwandt with BC Centre for Disease Control says because the vaping industry is a largely unregulated market, it’s hard to pinpoint the cause of mysterious cases in the United States.