Fuente: WIPO "tomato" A solid aerosol precursor (6), where the solid aerosol precursor (6) comprises fine plant material particles and coarse plant material particles, the fine plant material particles having a first monomodal particle size distribution by number having a D50 particle size of from 40 to 100 µm, and the coarse plant material particles having a second monomodal particle size distribution by number having a D50 particle size of from 225 to 600 µm, where combining together the first monomodal particle size distribution and the second monomodal particle size distribution results in a bimodal particle size distribution. The consistency of the particle size, and flavour and structure of the solid aerosol precursor may be improved.