Expert Toker?

Evidence Text Book Note: See United States v. Johnson, 575 F.2d 1347, 1360 (5th Cir.1978) (An experienced user, who "had smoked marijuana over a thousand times," was permitted to testify that a certain marijuana came from Columbia. "He based his identification upon the plant's appearance, it's leaf buds, stems, and other physical characteristsics, as well as upon the smell and the effect of smoking it.")