GENERAL KNOWLEDGE

Detailed explanation-1: -Tobacco leaves and the smoke generated when they are burned contain over 4 thousand chemicals, 3 the best known of which is nicotine, first isolated from tobacco leaves in 1828 by Posselt and Reimann. It is the nicotine that causes smokers to become addicted to tobacco, and the chemical itself is lethal in small doses.

Detailed explanation-2: -Two main species of tobacco are grown today: Nicotiana tabacum, indigenous to South America, and Nicotiana rustica, found in the West Indies and eastern North America [2]. Tobacco is found not only in cigarettes but also snuff, chewing tobacco, smokeless tobacco, hookah, and cigars.

Detailed explanation-3: -Nicotine belongs to a family of compounds called alkaloids and occurs naturally in several varieties of plant – including tomatoes, aubergines and potatoes – but is found at its highest levels in the tobacco plant.