Getting a Medical Marijuana Card in Boston, MA Get a medical marijuana card in Boston, MA online with Leafwell MD Address: 6 Liberty Square, Boston, MA 02109, USA Phone: +1 (800) 660-9085 You don’t have to visit, and you can get your Boston MMJ card and physician’s medical cannabis certificate online with Leafwell. You can’t use marijuana in any form (smoking, vaping, edibles, etc.) in public or on federal land. In November of 2012, 63 percent of voters endorsed Question 3, making Massachusetts the 18th state in the country to allow medical marijuana use. Under the medicinal marijuana statute, which went into effect in 2013, qualifying patients 18 years of age or older with certain debilitating medical conditions can possess and use marijuana if they have a physician certification. Under Massachusetts’ recreational cannabis laws, adults 21 years of age or older are allowed to possess up to one ounce of marijuana or 5 grams of concentrate outside of their residence and up to ten ounces of marijuana inside their residence. Adults may possess and cultivate up to 6 marijuana plants per resident with a maximum of 12 per household.