A December 2022 paper by London-based researchers discussed the findings of a study that analyzed patient responses to a questionnaire that measured anxiety, sleep quality, and PTSD symptoms specifically avoidance, intrusions, and hyperarousal. A total of 144 patients were studied at baseline, then again at 1, 3, and 6 months after they started medicating with cannabis. The researchers noted significant improvements across all three scores throughout the follow-ups. Side effects caused by cannabis use were rated either moderate or mild, though fatigue and insomnia were the most predominant.