Question

Which is the habit-forming ingredient of tobacco?

(a) Nicotine

(b) Tar

(c) Catechol

(d) Phenol

I have been asked this question in an interview.

My doubt stems from Human Health and Disease in division Human Health and Disease of Biology – Class 12

Answer 1

The correct option is (a) Nicotine

For explanation I would say: Habit-forming active ingredient of tobacco is nicotine. It is synthesised in the roots but accumulates in the leaves. Nicotine content of tobacco leaf is 0.5-8%. A cigarette contains 6-11 mg of nicotine, out of which 1-3 mg is inhaled.