(Reuters) -Shares of pot companies advanced in early premarket trading on Monday following a social media post by U.S. President Donald Trump over the weekend that suggested potential health benefits from the use of cannabidiol. Trump's post on Sunday said cannabidiol (CBD) could "revolutionize senior healthcare" by helping reduce disease progression and was shown as an alternative to prescription drugs. In early August, Trump had said his administration was looking to reclassify the drug, which could al ...