Americans report using marijuana more frequently than alcohol. What are the risks of both? Listen · 6:31 6:31 Toggle more options Download Embed Embed iframe src="https://www.npr.org/player/embed/nx-s1-4977448/nx-s1-d0845a3c-c9e5-45ee-b101-6739f848630d" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">