Don't press the buy button just yet.Many cannabis stocks have experienced significant growth over the past six months. For instance, shares of Tilray Brands (TLRY +0.11%) have increased by 125% over this period, while those of Curaleaf Holdings (CURLF 1.94%) have risen by 212%.The main reason for this rally is that the market was becoming increasingly optimistic about potential movement in the U.S. cannabis industry's regulatory landscape. These hopes proved correct: President Donald Trump recently signed a ...