Aerosol-generation devices

1. An electronic cigarette comprising:

at least two reservoirs, each arranged to contain a separate aerosol producing composition wherein at least one of the reservoirs includes a flavorant;

means for drawing the compositions from the reservoirs to generate an aerosol for inhalation for a user; and

means for mixing the compositions after they have been drawn from the reservoirs, the mixing means being arranged to allow a user to select the relative proportions of the two compositions in the aerosol,

wherein the means for mixing comprises a user actuated valve which can be operated to selectively connect each of two or more of the reservoirs to a transfer element forming part of at least one heater assembly.

2. The electronic cigarette according to claim 1 , further comprising:

a power source;

means for selectively supplying power from the power source to the heater assembly; and

control means for selectively controlling the heating of the composition from one or more of the reservoirs by the heater assembly, such that, when power is supplied to the heater assembly together with the selected the composition, an aerosol is generated for inhalation by a user.

3. The electronic cigarette according to claim 2 , wherein the means for selectively supplying power from the power source to the at least one heater assembly is a switch activated by a user drawing air through the aerosol-generating device.

4. The electronic cigarette according to claim 2 , wherein the at least one heater assembly comprises a heating element associated with each reservoir, and the control means is arranged such that a user can select the amount of power to be applied to each heating element to thereby control the amount of the composition from each reservoir that is used to generate the aerosol.

5. The electronic cigarette according to claim 4 , wherein the control means is arranged to allow alternate pulsed power supply to each heating element of the heater assembly.

6. The electronic cigarette according to claim 2 , wherein the at least one heater assembly has a heating element associated with each reservoir and the control means comprises a valve for controlling the flow of air over each heating element, thereby controlling the amount of the composition that is used from each reservoir to generate the aerosol.

7. The electronic cigarette according to claim 2 , further comprising an elongated body into which said reservoirs and said control means are embedded, said elongated body further comprising at least one air intake and at least one mouthpiece section for a user to draw air inside the elongated body to mix with said aerosol and to inhale the mixed aerosol composition through the mouthpiece.

8. The electronic cigarette according to claim 2 , further comprising an elongated body including a mouthpiece for a user to draw air inside the elongated body, wherein the power source is lodged in said elongated body and the at least one heater assembly and the at least two reservoirs are lodged in the mouthpiece of the elongated body.

9. The electronic cigarette according to claim 1 , wherein the reservoirs are arranged to hold the compositions under pressure.

10. The electronic cigarette according to claim 1 , wherein the means for drawing the compositions from the reservoirs is a source of high pressure gas; and wherein the means for enabling a user to control the relative proportions of the compositions is a variable proportion valve.

11. The electronic cigarette according to claim 1 wherein the reservoirs are refillable.

12. A mouthpiece portion for an electronic cigarette, the mouthpiece comprising:

at least two reservoirs, each arranged to contain a separate aerosol producing composition wherein at least one of the reservoirs includes a flavorant;

means for drawing the compositions from the reservoirs to generate an aerosol for inhalation for a user; and

means for mixing the compositions after they have been drawn from the reservoirs, the mixing means being arranged to allow a user to select the relative proportions of the two compositions in the aerosol,

wherein the means for mixing comprises a user actuated valve which can be operated to selectively connect each of two or more of the reservoirs to a transfer element forming part of at least one heater assembly.