Have you considered the benefits of smoking?
It is refreshing, keeps you alert, increases your heart rate - which in turn circulates your blood and antibodies much more efficiently, making the healing process quicker.
It furnishes your lungs with a protective layer of tar that prevents a multitude of viral and bacteriological agents from penetrating into the blood system.
In effect it prolongues life. Theoretically - The more you smoke, the longer you will live.
I suggest moving on to cigars...They last longer and provide a thicker coating of tar.