By Carie P. WATCH RELATED VIDEO Submit People attend the Cannabis World Congress Expo on June 19, 2015 in New York City. Marijuana consumption is growing into a multimillion dollar industry as marijuana use - both recreational and medicinal- becomes legal in more U.S. states and more socially accepted. Advertisement © 2017 HNGN, All rights reserved. Do not reproduce without permission. Advertisement 0 COMMENTS CLOSE COMMENT Get HNGN's Top Stories Newsletter Everyweek You have already subscribed. Thank you.