Cannabis has gone from the black market to the stock exchange but it could prove a risky investment.

Investments in the marijuana industry are expected to reach $15 billion this year.

However, one of the largest Canadian producers, Aurora Cannabis debuted two days ago - and its shares plummeted 14 per cent yesterday.

New Cannabis Ventures CFO Alan Brochstein told Kate Hawkesby there's a lot of enthusiasm right now.

"Investors need to be very careful in terms of how much they allocate to this space, it is really risky and volitile but the fundamentals are really showing up."

He said a few years ago, public companies had zero revenue but now we're seeing very large revenues reported.

LISTEN ABOVE AS ALAN BROCHSTEIN SPEAKS WITH KATE HAWKESBY