Feb 12 (Reuters) - Canada’s main stock index opened lower on Friday, dragged down by cannabis companies while a handful of dismal corporate earnings from Enbridge Inc and CAE Inc further dented sentiment. * At 9:35 a.m. ET (14:35 GMT), the Toronto Stock Exchange’s S&P/TSX composite index was down 37.81 points, or 0.21%, at 18,355.18. (Reporting by Amal S in Bengaluru, Editing by Sherry Jacob-Phillips)