a cold smoke generating device includes an air source that may include a hollow flexible collapsible container having an expandable and compressible cavity for accepting air and air - borne reagent therein . the collapsible container is fluidly connected with a narrow flexible extension that includes an elongated cavity or chamber . isolated and / or free reagents are disposed within the chamber of the narrow flexible extension . these reagents are capable of reacting with each other , with atmospheric air , or with other gases and fluids to generate a visible aerosol when expelled into the surrounding air .