Provided herein is a method of pulmonary delivering to a subject at least a first pharmacologically active agent and a second pharmacologically active agent, at least one of which being in at least one plant material； the method is carried out by independently delivering the agents to the subject using a metered dose inhaler device that is configured to vaporize at least a first pre-determined vaporized amount of the first agent and at least a second pre-determined vaporized amount of the second agent upon controllably heating the plant material, wherein heating is effected such that the first pre-determined vaporized amount is delivered to the subject successively, concomitantly and/or at least partially overlapping with the delivery of the second pre¬ determined vaporized amount, and wherein each of the pre-determined vaporized amounts of each of the agents independently induces in the subject at least one pharmacokinetic effect and/or at least one pharmacodynamic effect.
