First things first I'd say to get very clear are you looking for a "business partner" or are you looking for a "mentor." Two different things.

If in the US there's non-profits, incubators, Etc. to find mentors.

www.score.org is a free service for US citizens and I would start there.

Keep in mind that your product is marijuana so I would request a mentor in the states it's been legalized. I would look into the community for marijuana and see what business networks exist for the product. Hope this helps.