Which drug is commonly found in sleeping pills?

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

Nicotine intake stimulates the $...A...$ to release $...B...$ and $...C...$ into blood circulation. This leads to an increase in $...D...$ and an increase in $...E...$. Here $A$ and $E$ refer to:

Which of the following effects is $NOT$ caused by nicotine?
$(i)$ Stimulates the secretion of adrenaline. $(ii)$ Causes inflammation in the trachea. $(iii)$ Increases blood sugar levels. $(iv)$ Causes oxygen deficiency in the body. $(v)$ Stimulates the secretion of digestive juices from the stomach.

Which are the drugs that are normally used as medicines to help patients cope with mental illnesses like depression and insomnia and are often abused?

Heroin is extracted from which plant family?