Have you all encountered providers identifying this syndrome? I think it's under-identified. It's marijuana induced vomiting.
In my state, marijuana has been made legal. Pts are becoming more open about their usage. This makes it more comfortable to approach the subject. One, occasional side effect of cannabinoid usage is hyperemesis. I've been educating my pts regarding this, even if they don't admit that they use.
http://en.wikipedia.org/wiki/Cannabinoid_hyperemesis_syndrome