It's illegal to smoke marijuana openly or in public, and I didn't observe anyone flouting the law at the zoo, playground or park. But that doesn't mean people don't bend the rules by, say, smoking pot on their front porch. My friends actually spoke to their neighbor about this particular habit, as they don't particularly like the smell of marijuana and didn't want their children exposed to it. To hear them tell it, it was the same kind of conversation you might have with somebody who insisted on smoking cigarettes right outside their window.