20 U.S. states now regulate medical marijuana . Many medical experts remain ambivalent on the issue . `` I have sat in labs and personally analyzed the molecules in marijuana that have such potential but are also a source of intense controversy . There is growing pressure to remove marijuana 's Schedule I classification . Anti - legalization groups are working to combat upcoming votes .
20 U.S. states now regulate medical marijuana . Many medical experts remain ambivalent on the issue . There is growing pressure to remove marijuana 's Schedule I classification . Anti - legalization groups are working to combat upcoming votes .