Alcohol is harmful for

Physical and mental dependency over any specific drug is known as

Many secondary metabolites of plants have medicinal properties. It is their misuse that creates problems. Justify the statement with an example.

Given effects due to ........

- Cancer of lung

- Bronchitis

- Gastric ulcer

- Emphysema

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

Ingestion of marijuana leads to illusions and alters the thoughts, feelings and perceptions of a person. Marijuana is a