Seniors are increasingly passing the pipe. About 9% of US adults between the ages of 50 and 64 have used marijuana at least once during the survey year, while 3% of those over 65 have done so, new research finds.

For middle-age adults, the percentage of cannabis users has doubled over nearly a decade, according to the study, published Thursday in the journal Drug and Alcohol Dependence.

Older adults have seen a seven-fold increase in that period.

Though marijuana use is increasing among older Americans, "most of these people are not first-time users," said Joseph Palamar, senior study author and an associate professor in the Department of Population Health at New York University Langone Medical Center.

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Susan Scutti ~ CNN.com ~