An innovative co-working space in Calgary has found itself among the city's countless other employers who are in a hazy fog of unknowns when it comes to how to approach the legalization of the recreational use of cannabis.

A worker can test positive if they've been exposed to second-hand smoke in a poorly ventilated room, according to a recent study at the University of Calgary.

Hundreds of employers and stakeholders turned out at a WorkSafe NB panel discussion on marijuana in the workplace. With the legalization date less than a year away, many say it’s still a “complex issue”.

The report, titled "Clearing the Haze," predicts that cannabis use in the workplace will increase once it is legalized.