SALEM, Ore. — Oregon lawmakers may tighten restrictions on the state’s organ transplant centers to ensure they don’t discriminate against patients based on marijuana use. House Bill 2687, sponsored by Rep. Rob Nosse, D-Portland, would stop medical providers from recommending that transplant candidates be removed from the organ waiting list managed by the nonprofit United Network for Organ Sharing because they tested positive for pot, the Statesman Journal reported. In Oregon, more than 850 transplant candidates are on the wait list for organs, according to the organ network. About 340 transplants were performed in Oregon last year. For some, symptoms before surgery are severe enough they turn to medical marijuana for relief. Responding to Nosse’s bill, the state’s major transplant centers disputed turning patients away based on marijuana use. “No transplant candidates are turned away from the OHSU Transplant Program because they use marijuana,” said Tamara Hargens-Bradley, a spoke..