“Clinical research from New Mexico supports a conclusion that smoking cannabis [marijuana] is associated with PTSD symptom reduction in some patients.”

http://www.news-medical.net/news/20140523/Smoking-cannabis-associated-with-PTSD-symptom-reduction-in-some-patients-says-study.aspx

“PTSD Symptom Reports of Patients Evaluated for the New Mexico Medical Cannabis Program”  http://www.tandfonline.com/doi/full/10.1080/02791072.2013.873843#.U39UHBVX-uY

http://www.thctotalhealthcare.com/category/post-traumatic-stress-disorder-ptsd/