The months after a breast cancer diagnosis can be frightening as patients weigh the pros and cons of treatment approaches. Patients may discuss radiation, chemotherapy, mastectomies and reconstruction with their oncologists. These days, there’s another thing that patients might add to that list: cannabis. Many people who have never tried cannabis before may seek it out while undergoing cancer treatment because they’ve heard it relieves pain, suppresses nausea or stimulates appetite. Yet many oncologists are…