Canada is about to become the second country to legalize recreational marijuana, which could mean big gains for cannabis companies now listed on U.S. exchanges.

So, what's an investor to do?

TheStreet's founder and Action Alerts Portfolio manager, Jim Cramer, tackled that very question during his Bootcamp for Investors held in New York.

Cramer sat down Saturday for an exclusive chat with Bill Newlands, COO of Constellation Brands, and Bruce Linton, CEO of Canopy Growth. 

Canopy's CEO told Jim Cramer, "Don't be too excited because there's October 17th and October 18th".  Cramer asked "What will happen in your mind, both when the stock market and in Canada when cannabis becomes legal?"

Linton responded by telling Cramer about a recent trip to London. He said in every meeting, everyone is talking about Brexit, "If you come to Canada, everyone's talking about marijuana."

"The 17th is going to be a big first step and it will be a wobbly first step". He added, "The stocks will go up, down, sideways...hard to know."

Watch the video above for more. More from the event can be found here: Inside Jim Cramer's Bootcamp for Investors.

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