Smoking substitute apparatus

A smoking substitute system for generating an aerosol, comprising:

• i) a smoking substitute apparatus;
• and
• ii) a main body
• wherein the smoking substitute apparatus comprises:
• a housing;
• an air inlet and an outlet formed at the housing;
• a passage extending between the air inlet and outlet, air flowing in use along the passage for inhalation by a user drawing air through the apparatus;
• and
• an aerosol generation chamber containing an aerosol generator being operable to generate an aerosol from an aerosol precursor;
• wherein the aerosol generator is in fluid communication with a downstream portion of the passage for allowing the aerosol to entrain into an air flow along the passage;
• wherein the downstream portion of the passage comprises a flow converging section having a curved sidewall tapered towards the outlet, and wherein an upstream end of the flow converging section substantially conforms to a cross sectional profile of the aerosol generation chamber, and
• wherein the curved sidewall of the flow converging section comprises a sigmoidal profile along a longitudinal axis of the downstream portion of the passage,
• wherein the main body is configured to engage with the smoking substitute apparatus, and wherein the main body comprises a controller and a power source configured to energize the aerosol generator.

A method of using a smoking substitute apparatus, the smoking substitute apparatus comprising:

• a housing;
• an air inlet and an outlet formed at the housing;
• a passage extending between the air inlet and outlet, air flowing in use along the passage for inhalation by a user drawing air through the apparatus;
• and
• an aerosol generation chamber containing an aerosol generator being operable to generate an aerosol from an aerosol precursor;
• wherein the aerosol generator is in fluid communication with a downstream portion of the passage for allowing the aerosol to entrain into an air flow along the passage;
• wherein the downstream portion of the passage comprises a flow converging section having a curved sidewall tapered towards the outlet, and wherein an upstream end of the flow converging section substantially conforms to a cross sectional profile of the aerosol generation chamber, and
• wherein the curved sidewall of the flow converging section comprises a sigmoidal profile along a longitudinal axis of the downstream portion of the passage,
• wherein the method comprises the steps:
• i) generating the aerosol with the aerosol generator;
• ii) drawing on the apparatus to induce an air flow along the passage for entraining the generated aerosol.