Abstract: To study the influences of types and contents of aerosol carriers on pyrolysis and smoke release of tobacco granules, wet granulation of tobacco was prepared with different glycerin/propylene glycol ratios. The granule samples were studied with thermogravimetric-Fourier transform infrared (TG-FTIR), cone calorimeter (CONE), and steady-state pyrolysis. The aerosol particle size formed was analyzed using an impact particle analyzer. The results showed that: 1) With the increase of propylene glycol, the initial weight loss rate and total weight loss of tobacco granules increased significantly. The main weight loss temperature region shifted towards lower temperature regions. The main thermal weight loss temperature range prepared with single aerosol carrier was narrower than that with the mixed aerosol carrier. Moreover, the weight loss rates at the oxidative pyrolysis stage were inversely proportional to the glycerin content. 2) The infrared spectra indicated that tobacco granules began releasing aerosol carrier from 100 ℃ when propylene glycol was added. With the increase of propylene glycol content, the releases of carbohydrates, phenols, organic acids, amines (eg. nicotine), alkanes, olefins and other compounds changed in a complex manner. At the oxidative pyrolysis stage, the main gaseous products from tobacco granules containing glycerin were CO₂, H₂O, CO and carbonyl compounds. With the increase of propylene glycol content, the characteristic peaks of hydrocarbons and carbonyl compounds were strengthened, and the intensities of characteristic CO and CO₂ peaks increased at 350 and 400 ℃ respectively, suggesting a more severe pyrolysis of tobacco. 3) With the increase of propylene glycol, the range of smoke release time decreased, the total amount of smoke release reduced. The tobacco granules prepared with 30% (mass fraction) propylene glycol had the slowest initial smoke release rate. With the increase of glycerin content, the release rates of CO and CO₂ from tobacco granule decreased. 4) With the increase of glycerin content, the total mass of aerosol increased, while the mean particle size of aerosol decreased first and then increased.