Long before cannabis gained mainstream acceptance, Nelson made the case that its dangers were greatly exaggerated and its benefits were scarcely mentioned. Willie Nelson has rightly received many lifetime achievement awards, including one from the Recording Academy in 1999, another from the Country Music Association in 2012 (which named the award in his honor), induction into the Country Music Hall of Fame in 1993, a Kennedy Center Honor in 1998 and the Library of Congress’…