what is the main addictive drug in tobacco Commonly Used Drugs - Tobacco/Nicotine Tobacco Addiction: Symptoms, Causes, Effects,
Description
When used, accessory muscles cause the appearance of indrawing, where there is observable sucking in of muscles during the breathing cycle

Actually, that's not true

Cigarettes Become Cool After World War I Chewing tobacco and pipes were more popular than cigarettes at the turn of the 20th century, with many people associating cigarettes to boyhood, adolescence, rebellion, says Allan Brandt, professor of the history of medicine and public health at Harvard University and author of The Cigarette Century: The Rise, Fall, and Deadly Persistence of the Product That Defined America

Discussion This study implemented multiple machine learning classifiers and ANN to predict smoking status based on clinical bio signal parameters

If you choose to switch to vaping, be aware that you may decrease carcinogen consumption but dramatically increase nicotine consumption

Electroencephalographic effects of intravenous nicotinea dose-response study