A team at the University of Michigan Medical School has been given a $2.2 million federal research grant to study the use of medical marijuana for pain.

Researchers at U-M hope the study can provide scientific insight to the long-term impacts of medical marijuana use and information as to the types of patients that seek the drug.

Researchers at the University of Michigan have been given $2.2 million to study the use of medical marijuana.

Associated Press file photo

An associate professor in U-M’s Department of Psychiatry, Ilgen is the principal investigator for the research.

More than 135,000 patients in the state are registered medical marijuana users. Michigan is one of 20 states that have legalized marijuana for medical purposes, as well as the District of Columbia.

The four-year grant from the National Institute on Drug Abuse to U-M researchers will fund a study of 800 patients.

Patients cannot volunteer to be a part of the study. The research team will be recruiting patients who are seeking to become a registered medical marijuana user in Michigan by approaching them at their first doctor’s appointment at participating clinics.

Patients that agree to participate will be asked a detailed survey of questions every six months throughout two years. Researchers plan to examine the patients’ symptoms, everyday functions and use of health care services.

“Marijuana is the most frequently used drug in the nation, and has been legalized for medical use in many ways, yet we have very little understanding of how individuals using medical marijuana do over time,” according to a statement from Frederic Blow, a co-investigator on the study.

Blow is a substance abuse researcher who directs the Mental Health Services Outcomes & Translation Section at the Medical School.

Amy Biolchini covers Washtenaw County, health and environmental issues for AnnArbor.com. Reach her at (734) 623-2552, amybiolchini@annarbor.com or on Twitter.