Which drug is commonly found in sleeping pills?

Cocaine is commonly called as $:-$

What happens to the tolerance level when a person repeatedly uses drugs?

Which of the following factors is responsible for drug and alcohol abuse among adolescents?

For Assertion $A$ and Reason $R$:
Assertion $A$: Smoking increases blood pressure and heart rate.
Reason $R$: Nicotine stimulates the adrenal gland.

Which syndrome is caused by the sudden withdrawal of drugs or alcohol?