Canna~Fangled Abstracts Comparative effects of pulmonary and parenteral Δ9-tetrahydrocannabinol exposure on extinction of opiate-induced conditioned aversion in rats. 2014 Nov 15. Comparative effects of pulmonary and parenteral Δ9-tetrahydrocannabinol exposure on extinction of opiate-induced…Freedom WaresNovember 15, 2014