Question

difference between fog and smoke

Answer 1

Fog is water vapor in atmosphere which condenses due to low temperature and forms dense white thing in atmosphere,it is not a pollutant but it  reduces visibility.
Smoke is a collection of airborne solid and liquid particulates and gases emitted when a material undergoes combustion.

 Dispersed phase of smoke = Solid
Dispersion medium of smoke = Gas

Fog:

Dispersed phase : Liquid
Dispersing medium: Gas

Answer 2

Fog is an atmospheric component which contains water micro droplets and tiny ice crystals ,in the form of the visible aerosols.This is mainly seen in the higher altitudes or in the cold regions.

On the other hand,

Smoke is a bunch of airborne particles of micro solids or gases or liquids,in a visible form due to it's physical density.