Difference Between Cigarette Smoke and Heated Tobacco Product (HTP) Aerosol

In cigarettes 

Smoke contains solid particles and liquid droplets therefore it is an aerosol. However, it is a complex mixture that contains a large number of carbon-based solid particles and thousands of chemicals and formed during combustion. Around 100 of these have been recognized as harmful chemicals by health authorities. 

In Heated Tobacco Products 

HTPs generate aerosols containing liquid droplets and gas. They are not smoke as there is no combustion.