A vaporizing device including a reservoir to store a liquid precursor, a dispenser to regulate the flow of the liquid precursor, a chamber to receive the liquid precursor and generate vapor, and a heater to supply heat to vaporize at least a portion of the liquid precursor, an inlet to admit air, and an outlet that includes a tortuous flow path geometry configured to condition vapor or aerosol prior to delivery to a user. The chamber may include geometries that enhance thin film vaporization or induce rotational flow. A controller may be provided to regulate power delivered to the heater, estimate heater temperature, compare detected inhalation parameters to stored inhalation profiles, and responsively adapt operation. In some embodiments, the controller may operate in an idle or standby mode to maintain a minimum temperature. The device may also include valves to inhibit leakage of the liquid precursor when not in use.