***Study enrollment is now closed***

Thanks to everyone for participating.



We are Conducting
The Largest Observational Study on Cannabis in Canada

Canadian Cannabis Clinics recently partnered with CanvasRx Inc. and Drs. Hance Clarke and John Hanlon to launch what will be the largest observational study of medical cannabis of its kind in Canada. We hope to enrol 1,000 patients and observe them over the course of 12 months.

The study is designed to identify any beneficial or adverse effects of inhaled (smoked or vaporized) cannabis prescribed by our 24 clinic locations in Ontario.

The study is a multicentre, longitudinal, non-interventional, observational study designed to provide an understanding of the beneficial and adverse effects of cannabis. All patients in the study will be 25 years or older, who have been prescribed cannabis for a chronic condition. Participants will be asked to self-administer validated pain, psychological and sleep questionnaires throughout the study. The study team includes Drs. Hance Clarke (MD PhD FRCPC), John Hanlon (MD, MSc, FRCPC), Howard Meng (MD) and Laura Zielinski (MSc).


How to Enrol in the Study


If you are interested in being a participant in the study, you must be:

  • English-speaking patients
  • 25 years of age or older
  • Able to provide informed consent
  • Have been prescribed cannabis for a chronic condition from one of our 24 Ontario clinic locations

If you wish to book an appointment with one of the above-mentioned Canadian Cannabis Clinics locations, please click visit our Contact Us page.

Exclusion Criteria: As per Health Canada Guidelines for cannabis use, patients that meet any of the following criteria will be excluded from the study:

  • Are under the age of 25
  • Are allergic to cannabis, any cannabinoid, or to smoke
  • Have serious liver, kidney, heart or lung disease
  • Have a personal or family history of serious mental disorders such as schizophrenia, psychosis, depression, or bipolar disorder
  • Are pregnant, are planning to get pregnant, or are breast-feeding
  • Are a man who wishes to start a family
  • Have a history of alcohol or drug abuse or substance dependence



Dr. Hance Clarke. Dr. Clarke, MD, PhD, FRCPC, is an Assistant Professor at the University of Toronto, as well as a Staff Anesthesiologist and Medical Director of the Pain Research Unit in the Department of Anesthesia and Pain Management at Toronto General Hospital.

Dr. Clarke holds is PhD from the Institute of Medical Sciences, University of Toronto, is a Clinician Scientist from the Royal College Clinical Investigator Program and holds a FRCPC Subspecialty Certification in Anesthesia.

Dr. Clarke’s interests include evaluating the efficacy of preventive analgesia, identifying novel acute pain treatments following major surgery, identifying the factors involved in the transition of acute postsurgical pain to chronic pain, studying the genetics of acute and chronic pain after surgery, and identifying risk factors associated with continued opioid use and poor health related quality of life after major surgery.


Dr. John Hanlon. Dr. Hanlon, MD, FRCPC, is the Inaugural Program Director of the University of Toronto Pain Medicine Residency. He is also an Assistant Professor in the University of Toronto, Department of Anesthesia and practices anesthesia and pain medicine physician at St. Michael’s Hospital in Toronto where he is the Co-Director of the Chronic Pain Service.

He completed an anesthesia residency and chronic pain fellowship at the University Toronto before completing a research fellowship in pain medi- cine at the University of Washington in Seattle.

His primary clinical and research interests include medical education, neu- ropathic pain, chronic postsurgical pain and the role of ultrasonography in pain medicine.


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Our staff is committed to helping patients with a variety of conditions manage their symptoms through the use of medical cannabis.

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Canadian Cannabis Clinics is committed to educating patients, physicians and the general public about the effective use of medical cannabis.

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We collaborate with academic researchers to advance the state of the science regarding the medical use of cannabis.