From the outside, the moms gathered in a Santa Monica, California, living room could have been conferring about carpools, school boards or fundraisers, any of the myriad mundane meet-ups that come with parenting. A quick survey of the scene might miss the spindly potted pot plant a few feet away on the deck. It most likely would have skipped right over one mother’s dangly pot-leaf earrings or another’s black T-shirt emblazoned with “Moms who smoke weed aren’t bad moms.” Moms in the US state of California, like everyone else here aged 21 or older, are within their legal rights to smoke weed, wh…