A six-foot cannabis leaf painted on the front door proudly advertises the wares of the San Francisco Cannabis Cultivators Club. Inside the five-story glass-and-concrete emporium on busy Market Street, origami cranes and LEGALIZE POT posters provide the decor, while live flamenco dancers on a third-floor stage supply the entertainment. At either of two bars, customers--all of whom are at least nominally required to show they have come on doctor's orders--can choose from among 10 grades of marijuana leaf, along with capsules, tinctures and half a dozen varieties of pot-laced baked goods. A lavender haze of smoke fills the air.
"Want to...