Electronic vapor provision system

A method of operating an electronic vapor provision system comprising a vaporizer for vaporizing aerosol precursor material for inhalation by a user of the electronic vapor provision system, a power supply for supplying power to the vaporizer, a wall defining an air flow path along which air travels through the electronic vapor provision system when a user inhales or exhales on the electronic vapor provision system, and a heatable temperature sensor mounted in the air flow path adjacent a portion of the wall of the air flow path, the method comprising:

• causing power to be supplied to the heatable temperature sensor to heat the heatable temperature sensor to a temperature above ambient temperature;
• and
• causing power to be supplied to the vaporizer to vaporize the aerosol precursor material in response to detecting a change in temperature of the heatable temperature sensor;
• wherein the air flow path is arranged such that, during inhalation by the user, air travelling along the air flow path is directed at the heatable temperature sensor in a direction that is towards the portion of the wall adjacent to which the heatable temperature sensor is mounted so as to disrupt the airflow around the heatable temperature sensor.