Method of manufacturing an aerosol-generating film

A method of manufacturing an aerosol-generating film for generating an aerosol upon heating, the method comprising:

• preparing a film-forming composition comprising:
• a cellulose based film-forming agent,
• a non-cellulose based thickening agent,
• at least about 30 wt percent of water, and
• at least about 20 wt percent of a polyhydric alcohol, wherein the polyhydric alcohol is glycerin;
• forming a layer of the film-forming composition, the layer having a thickness of less than 1 millimeter;
• and
• heating the layer of the film-forming composition to evaporate at least some of the water to obtain the aerosol-generating film, wherein the layer of the film-forming composition is heated to a temperature and for a time such that the aerosol-generating film contains less than or equal to about 30 wt percent of water,
• wherein the step of preparing the film-forming composition further comprises:
• dissolving the cellulose based film-forming agent and the non-cellulose based thickening agent in the water to form a water-based preparation,
• defoaming the water-based preparation, and
• mixing the polyhydric alcohol into the water-based preparation to obtain the film-forming composition.