MISSISSAUGA, Ont. - Ontario's premier says her government is going back to the drawing board on exempting medical marijuana users from an e-cigarette law.

Kathleen Wynne says many people have voiced concerns about the government's new regulations, and she's been listening.

The law that bans the use of e-cigarettes anywhere regular cigarettes are prohibited -- and the new medical marijuana exemption -- are set to take effect next month.

Wynne says the government is now rethinking the exemption because of concerns medical marijuana users could use vaporizers in restaurants, at work, on playgrounds or in other public spaces.

Associate Health Minister Dipika Damerla has said employers or restaurant owners could still ban medical marijuana users from vaporizing on the premises.

The regulations define a vaporizer as an electronic cigarette or other device that contains a power source and heating element that's designed to heat a substance to produce a vapour to be inhaled through the mouth.