The drug used to treat anxiety and insomnia is obtained from .....

$Heroin$ : slows down body functions :: $cocaine$ :

Cocaine is obtained from which plant?

Withdrawal symptoms of drug addiction are

What condition occurs in an individual if they suddenly stop the consumption of addictive substances?

Assertion $A$: Nicotine increases blood pressure and heart rate.
Reason $R$: Nicotine stimulates the adrenal gland.
Which option is correct for Assertion $A$ and Reason $R$?