Which among the following plants is a source of a drug and is native to America?

Which of the following is a mild stimulant?

What is the effect of nicotine on the human body?

In your view,what motivates youngsters to take to alcohol or drugs,and how can this be avoided?

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.

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