Early next month, the state Health Department is poised to select from one to three proposals for dispensaries that will sell medical marijuana and related products to patients in the growing medical marijuana program. JoAnne Leppanen, executive director of the Rhode Island Patient Advocacy Coalition, and others seeking to open the centers have varying views on whether it’s financially feasible for the state to have three dispensaries. On Tuesday, there were 3,239 patients and 2,039 licensed caregivers, or medical marijuana growers, in the program. Many of the patients also have caregiver licenses, meaning that they grow their own medical cannabis to deal with chronic pain, nausea and other medical ailments. But just about everyone in the industry predicts that the establishment of one, two or three dispensaries will lead to an immediate surge in the number of patients, who must get approval from the Health Department to use medical marijuana for.