It's not unusual for Canopy Growth co-CEO Bruce Linton to field strange emails. After all, he is the chief executive of one of the largest marijuana companies in the world.

So when an email landed in Linton's inbox in the spring of 2015 saying celebrity rapper Calvin Cordozar Broadus Jr., professionally known as Snoop Dogg, was interested in pursuing a business partnership, the CEO laughed.

"I didn't assume it was a legitimate email," Linton said to CNBC. "I thought it was a silly joke."

No joke, the hip-hop star was interested in Linton's Tweed business, a subsidiary of Canopy Growth that now offers recreational marijuana products and boasts more than 4.3 million square feet of indoor and greenhouse cultivation in Canada. About a year later, Tweed unveiled a partnership with the hip-hop icon, complete with three varieties of cannabis in Canada under the "Leafs by Snoop" brand.

Snoop Dogg's talent agents at Stampede Management reached out to Canopy last year suggesting it talk with one of his celebrity friends: Martha Stewart, the lifestyle authority who co-hosts their VH1 show "Martha & Snoop's Potluck Dinner Party." Stampede did not respond to CNBC's request for comment.

"I was probably more excited to meet Martha than I think almost any other celebrity I've been introduced to," Linton said. "I'm running a very large marijuana company and here I am meeting a person considered a leader on all things etiquette."