British American Tobacco BATS.L said on Thursday it will buy a nearly 20% stake in Canada-based cannabis producer Organigram OGI.TO for about 126 million pounds ($175.81 million) as it diversifies beyond its main tobacco business. GOL/O/R U.S. Treasury yields fell as concerns over a strong pick up in inflation eased on a tepid rise in U.S. consumer prices in February. The Toronto Stock Exchange's S&P/TSX composite index .GSPTSE ended 0.58% higher at 18,707.77 on Wednesday.