Converting a medical-marijuana industry into a recreational one in Canada will not be easy.

At a former Hershey’s chocolate factory just outside Ottawa a company called Tweed now produces a rather different confection: marijuana for Canada’s tightly regulated medical market.

Under the gaze of surveillance cameras, scientists in lab coats concoct new cannabis-based blends in near-sterile conditions.

A repurposed candy mixer does the blending.

Only in the growing rooms does the spirit of Cheech and Chong, a stoned comedy duo, seem to preside: the plants have names like Black Widow, Deep Purple, Chem Dawg and Bubba Kush.

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The Economist ~