Which substances are athletes increasingly using to enhance their performance?

Which of the following is a very potent hallucinogen?

Which substances are commonly used by individuals to stay awake at night?

Morphine, a pain reliever and cough suppressant alkaloid, is obtained from . . . . . . .

Nicotine is an alkaloid that enters the body through smoking. How many of the following characteristics are associated with its effects?
$(i)$ Increases blood pressure
(ii) Decreases respiratory rate
(iii) Causes cancer of the lungs,throat,and bladder
(iv) Induces allergies
$(v)$ Can cause emphysema
(vi) Decreases the level of $O_2$ in the blood

The use of nicotine causes: