A new state government report found that just over 3,600 people received legal medical marijuana in New Jersey over the first 25 months of the program.
An advocate for greater access of cannabis said that represents just a fraction of the people who could be helped by the drug, which remains illegal under federal law.
Coalition for Medical Marijuana New Jersey director Ken Wolski said the relatively low numbers reflect the high price of the legal drug and short list of qualifying medical conditions.
He hoped that more conditions such as chronic pain could be added.
State regulations said no new conditions could be added until after Tuesday's report was released.
New Jersey legalized medical marijuana in 2010. Currently, three clinics sell it.