The 73-year-old Grease star was diagnosed with stage four breast cancer four years ago. Olivia Newton-John joined the Today show earlier this week to discuss her fight against stage four breast cancer, a diagnosis she received four years ago. Speaking with Hoda Kotb, a breast cancer survivor herself, Newton-John said she’s not dwelling on the diagnosis and has benefitted greatly from the cannabis her husband grows at home. - Read the entire article at The…