Question

Why is cigaratte smoking injurious to health ?
Name the enzyme which is present in infants but may be absent in adults.​

Answer 1

Explanation:

cigaratte smoking is injurious to health because it affects our lungs,heart and different internal organs of our body which is cause of cancer and other non curable diseases.

Answer 2

Answer:

During smoking the cigarettes fumes make the walls alveoli very thin which causes rupturing of alveoli. This reduces the surface area for gaseous exchange in lungs .

To make up for the reduces gaseous exchange the heart has to pump more blood.