A method of analysing user interaction with an inhalation device 10, such as a tobacco industry product, comprising: detecting a sound (audio profile) generated by the use of the device over a time period encompassing one or more puffs 25； and processing the audio profile to extract at least one parameter of the user’s use of the product during the time period. The parameter may be: inhalation duration (d, Fig. 5) or inhalation cubic volume (area under the puff audio profile, Fig. 7). The duration of the puff may be the time which the amplitude exceeds a background noise threshold. The sound may be detected by: a single microphone 14； or microphone array, spaced along a line parallel to the device’s length. The microphone may be: placed in contact with or adjacent to the device； and be removably fastened onto the device (34, Fig. 2). The tobacco industry product may be a non-combustible vapour provision (vaping) device, and the microphone may be integrated onto or within the vaping device’s housing.
