in Marijuana In 1949, the U.S. Military created a synthetic… by Chirag Chauhan June 4, 2018, 4:06 am 275 Views In 1949, the U.S. Military created a synthetic version of Marijuana called “Dimethylheptylpyran.” Just 1 mg can have effects lasting for 3 days. DimethylheptylpyranMarijuanasynthetic Marijuana Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website By using this form you agree with the storage and handling of your data by this website. *