In this Feb. 26, 2016 photograph, a marijuana pipe is nearby, as former U.S. Marine, Mike Whiter answers a question about his marijuana use to treat post-traumatic stress disorder, at his home in Philadelphia. A growing number of states are weighing whether to legalize marijuana to treat PTSD. While the research has been contradictory and limited, some former members of the military say marijuana helps them manage their anxiety, insomnia and nightmares. (AP Photo/Mel Evans)