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A public health professor is warning a ban on e-cigarettes in Canada could create a black market for the product, and suggests stricter regulations are a better way to curb the surge in popularity of vaping amongst youth.

"We can't wish them away... to the extent that we have many, many Canadians using these products, I don't think pushing those folks outside the legal market makes sense," said David Hammond, a University of Waterloo professor whose research on chronic disease has recently focused on vaping.