A woman exhales while smoking marijuana during the annual 420 marijuana rally on Parliament Hill in Ottawa, Canada, Wednesday, April 20, 2016.
A woman exhales while smoking marijuana during the annual 420 marijuana rally on Parliament Hill in Ottawa, Canada, Wednesday, April 20, 2016. Justin Tang AP
A woman exhales while smoking marijuana during the annual 420 marijuana rally on Parliament Hill in Ottawa, Canada, Wednesday, April 20, 2016. Justin Tang AP

Secondhand pot smoke can give you more than just a contact high

April 21, 2016 10:00 AM

UPDATED April 22, 2016 07:06 PM

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