An electronic cigarette comprises an atomizer and a battery component connecting with the atomizer at one end thereof. The battery component comprises a battery sleeve, a rechargeable battery received in the battery sleeve, a battery seat disposed at the other end of the battery component opposite to the one end thereof to connect with the atomizer, and a pneumatic switch disposed in the battery component to electrically connect between the rechargeable battery and the atomizer. An opening is formed at a distal end of the battery seat facing away from the atomizer to allow electrical connection between a power supply and the rechargeable battery extending through the opening. The pneumatic switch is responsive to air flowing in the battery component so as to control electrical connection between the rechargeable battery and the atomizer and start the atomizer based on the air flowing.
