Beware of Tilray TLRY, warned Jim Cramer.

The founder of TheStreet is wary of cannabis stocks, excluding Canopy Growth (CGC) - Get Report . To better educate investors, Cramer is hosting a Teach In on Oct. 13 where the CEO of Canopy, Bruce Linton, and the COO of Constellation Brands (STZ) - Get Report , Bill Newlands, will speak.

To be a profitable investor and build long-term wealth, you need the right information and techniques. Join TheStreet Oct. 13, 2018 for a special investing event for sophisticated and active traders. Register for "Invest Like the Pros: Jim Cramer's Boot Camp for Investors" here.