Looking into the current session, SM Energy Inc. (NYSE:SM) shares are trading at $39.32, after a 1.23% drop. Over the past month, the stock decreased by 6.55%, but over the past year, it actually went up by 5.22%. With questionable short-term performance like this, and great long-term performance, long-term shareholders might want to start looking into the company’s price-to-earnings ratio. Comparing SM Energy P/E Against Its PeersThe P/E ratio is used by long-term shareholders to assess the company’s market performance against aggregate market data, historical earnings, and the industry at la…