Cisco Pike (1972). The title character is former music star, played by Kris Kristopherson, who gets out of jail after serving a sentence for dealing. The narc who sent him to prison, played by Gene Hackman (he also played "Popeye" Doyle in The French Connection), has just ripped-off 100 keys of primo bud from a Mexican, and enlists Pike (Kristofferson) into selling 10 grand worth of it for him in three days, after which he gets to keep the rest. Things do not go well.

Excellent cast includes Karen Black, Harry Dean Stanton, Doug Sahm and, in a bit role, Hugh "Wavy Gravy" Romney.

The weed shown in the film, fake or real, looks like bad brick schwag, but that does not detract from the movie at all.