There is substantial overlap between OCD, Anxiety, PTSD, ADHD and other Autism spectrum disorders and possibly also between the therapeutic potential of cannabinoids in the treatment of these disorders.
This opens the possibility that patients are, consciously or unconsciously, self-medicating. More research is required.
Several studies have pointed out a correlation between the occurrence of OCD and cannabis use (De Alwis et al., 2014; Bidwell et al., 2014; Loflin et al., 2014).
De Alwis, D., Agrawal, A., Reiersen, A.M., Constantino, J.N., Henders, A., Martin, N.G., and Lynskey, M.T. (2014). ADHD symptoms, autistic traits, and substance use and misuse in adult Australian twins. J. Stud. Alcohol Drugs 75, 211–221.
Bidwell, L.C., Henry, E.A., Willcutt, E.G., Kinnear, M.K., and Ito, T.A. (2014). Childhood and current ADHD symptom dimensions are associated with more severe cannabis outcomes in college students. Drug Alcohol Depend. 135, 88–94.
Deiana, S., Watanabe, A., Yamasaki, Y., Amada, N., Arthur, M., Fleming, S., Woodcock, H., Dorward, P., Pigliacampo, B., Close, S., et al. (2012). Plasma and brain pharmacokinetic profile of cannabidiol (CBD), cannabidivarine (CBDV), Δ9-tetrahydrocannabivarin (THCV) and cannabigerol (CBG) in rats and mice following oral and intraperitoneal administration and CBD action on obsessive-compulsive behaviour. Psychopharmacology (Berl.) 219, 859–873.
Loflin, M., Earleywine, M., De Leo, J., and Hobkirk, A. (2014). Subtypes of attention deficit-hyperactivity disorder (ADHD) and cannabis use. Subst. Use Misuse 49, 427–434.