In heavy smokers the alveoli of the lungs are enlarged and damaged which reduces the surface area for the exchange of respiratory gases. This condition is called

‘Bhang' and ‘Ganja' are

Why do some adolescents start taking drugs. How can this be avoided ?

Physical and mental dependency over any specific drug is known as

Heroin is obtained from plant of family

What is obtained from the plant Erythroxylum coca and mention its effects on human body