A proposed ballot measure that would increase state tobacco taxes and extend Montana’s expanded Medicaid program for 94,000 low-income adults has been approved for signature-gathering. A coalition of supporters also plans to kick off its campaign Thursday to gather the 25,000-plus signatures of registered voters needed to qualify Initiative 185 for the November ballot. “We have a short turnaround time for collecting signatures, but I’m super-excited about the energy and the support of this initiative,” said Kristin Page-Page-Nei of the American Cancer Society Cancer Action Network. “I have no doubt that we’re going to be able to qualify this.”