Arun Polisetti's answer: Tar is a sticky brown substance resulted from smoking and it also collective term of various particles suspended Arun Polisetti's answer: Tar is a sticky brown substance resulted from smoking and it also collective term of various particles suspended in tobacco smoke. Tar damages our cilia which are tiny hair lining to the upper air way. When cilia damaged tar ppenetrate to the lungs causes more damage to t... ...read more