As legalisation spreads across the US, the web is lighting up with advice on how to mix marijuana and motherhood. She looks like a model suburban housewife, beaming into the camera as she sifts through a pink leather handbag, explaining to her youtube viewers that she carries her children's inhalers with her at all times because "you gotta be prepared". Inside Kathryn VahEaton's own "medicine bag", though, is a pink pipe and a set of dainty purple pots-where she stores her stash. To her fans she is the Stoner Mom, a 34-year-old mother of four from Colorado whose blogs, videos...