As a libertarian (in principle if not party membership), I believe that individual determination regarding drugs is more consistent with the American spirit of individual liberty than control.  Laws pertaining to drug related misbehavior exist and are a different matter.  It will be unfortunate if Sessions undertakes to restrict liberty.  Recall the legitimization of abortion, i.e. a woman has a right to control her own body.  It this is true, then more generally, people have the same right in diverse situations including drug or smoking decisions.