Which one of the following statements is incorrect about drugs.

The correct answer is Option (2) → Cannabinoids are obtained from Papaver somniferum.

(1) Heroin, commonly called smack is chemically diacetylmorphine. — Correct statement. Heroin is made by acetylation of morphine.

(2) Cannabinoids are obtained from Papaver somniferum. — Incorrect statement. Cannabinoids come from the inflorescences of Cannabis sativa. Papaver somniferum is the opium poppy, the source of morphine.

(3) Excessive dosage of cocaine causes hallucinations. — Correct statement. Cocaine acts on the nervous system, and too much of it causes hallucinations.

(4) Morphine is an effective sedative and painkiller, and is useful in patients who have undergone surgery. — Correct statement. This is the medical use of morphine.

NCERT Extract:
Drugs and Alcohol Abuse –