The first-ever National Cannabis Summit took place this August in Denver, achieving a major goal – to open thoughtful, measured, and science-based discussion about the impact of marijuana policy on public health and safety. Over 500 people attended the summit, hailing from 43 states and Canada and representing a wide range of institutions, from academia and advocacy to military, government, and healthcare. Response was overwhelmingly positive with a focus on the quality of conversation, dialogue, and exchange.