AP Photo/Elaine ThompsonFriday is the last chance for Minnesota patients to weigh in on the Health Department's medical marijuana survey.

To participate, patients with qualifying medical conditions can log on here and fill out the form between now and Feb. 6.

The state's new Office of Medical Cannabis hopes the survey will answer some of the biggest questions still hanging over the upcoming legalization of medical marijuana. More than 1,100 patients have already weighed in.

The drug will be legal for patients with certain qualifying medical conditions -- including glaucoma, terminal illnesses, seizure disorders, muscular dystrophy and certain cancers -- in July. The two state-sanctioned manufacturers have begun growing the plants in secure greenhouses in Otsego and Cottage Grove and will soon begin refining it into pills and liquids -- the only legal forms the Minnesota Legislature approved.

But no one knows yet how many patients might be interested in signing up for the program. Nor does the state know how many of them live near one of the eight clinics where the cannabis will be sold.