Provided herein is a method of pulmonary delivering to a subject at least one pharmacologically active agent being in a plant material, which is effected by pulmonary delivering the agent to the subject using a metered dose inhaler device that is configured to vaporize at least one pre-determined vaporized amount of the agent upon controllably heating the plant material, wherein the pre-determined vaporized amount is selected so as to achieve at least one pre-determined pharmacokinetic effect and/or at least one pre-determined pharmacodynamic effect induced by the agent in the subject.
