No. Onsite consumption of marijuana is prohibited by the Medical Marijuana Dispensary Program rules.
The only exception is for an employee who is a current and valid Oregon Medical Marijuana Program patient who must medicate during working hours. Such consumption is only permitted if the employee is in a closed room, alone if the usable marijuana is being smoked, and not visible to the public, patients, or caregivers on the premises of the dispensary.
Please refer to Oregon Administrative Rule (OAR) 333-008-1200 for more.