SMOKING SUBSTITUTE APPARATUS

1 . A smoking substitute apparatus comprising an enclosure and an aerosol generator, the enclosure at least partially enclosing the aerosol generator, the aerosol generator comprising a heater and being operable to generate an aerosol by vaporizing an aerosol precursor, wherein at least part of the enclosure adjacent the heater is formed from plastics material, there being provided a heat shield between said part of the enclosure and the heater and there being a heat insulating gap between said part of the enclosure and the heat shield.

2 . A smoking substitute apparatus according to claim 1 , wherein the heat shield has a contact portion which is in contact with the enclosure.

3 . A smoking substitute apparatus according to claim 2 , wherein the contact portion has a surface area smaller than one quarter of a total surface area of the heat shield.

4 . A smoking substitute apparatus according to claim 2 or claim 3 , wherein the heat shield has a region proximal to the heater and a region distal to the heater, the contact portion being in the region distal to the heater.

5 . A smoking substitute apparatus according to any one of claims 2 to 4 , wherein the contact portion includes an end part of the heat shield.

6 . A smoking substitute apparatus according to any one of the previous claims, wherein the heat shield is fitted to the enclosure so as to restrict movement between the heat shield and the enclosure.

7 . A smoking substitute apparatus according to any one of the previous claims, wherein the heat shield provides an electrical connection between the heater and an electrical contact configured to connect with a power supply.

8 . A smoking substitute apparatus according to any one of the previous claims, wherein the heat insulating gap has a thickness of no more than 0.5 mm.

9 . A smoking substitute apparatus according to any one of the previous claims, wherein the heat shield is formed of a material selected from metals, thermosetting polymers and ceramics and composites thereof.

10 . A smoking substitute apparatus according to any one of the previous claims, wherein the heat shield presents to the heater a heat-absorbing surface having an area of at least twice as large as a plan view projection of the heater onto the heat shield.

11 . A smoking substitute apparatus according to claim 10 , wherein the area of the heat-absorbing surface of the heat shield is at least 20 mm 2.

12 . A smoking substitute apparatus according to any one of the previous claims, wherein there are provided first and second heat shield plates disposed on opposing sides of the heater.

13 . A smoking substitute apparatus according to any preceding claim, wherein the enclosure is sealed to air flow asides from an outlet.

14 . A smoking substitute apparatus according to any of claims 1 to 12 , wherein the enclosure includes an air inlet and an outlet, and wherein the heat shield is configured to heat air entering the enclosure through the air inlet.

15 . A smoking substitute apparatus according to any one of the previous claims, wherein the smoking substitute apparatus is comprised by or within a cartridge configured for engagement with a base unit, the cartridge and the base unit together forming a smoking substitute system.