DENVER (AP) — Former Broncos tight end Nate Jackson says he believes the NFL will have no choice but to remove marijuana from its lists of banned substances in the near future. Speaking at a marijuana business conference, Jackson called on the league to allow medical marijuana as a means to help players deal with the physical and psychological pain and head injuries inherent to their profession. Jackson said he avoided opiate painkillers as much as he could during his six-year career from 2003-08.