101012MEDMARJw_0.mp3

Using marijuana for medical purposes is already legal in 17 states, and next month Massachusetts could join that group.

Ballot question number 3 would authorize doctors to prescribe cannabis to treat debilitating medical conditions. And while the issue appears to have overwhelming support, opponents are urging voters not to let compassion cloud their common sense. WGBH’s Emily Rooney has more as part of our 30 Issues in 30 Days series.

Does medical marijuana matter to you? Vote in our poll.