* During the early 1900s, many academics and medical professionals believed that tobacco had therapeutic benefits and recommended its use for things like mood enhancement, better performance, and reduced boredom.
* Contrarily, tobacco was acknowledged as a highly addictive drug and one of the leading causes of illness and death worldwide by the early 21st century. 
*Currently , tobacco products are produced using a variety of additives to extend their shelf life, change the way the tobacco burns, regulate the amount of moisture in the tobacco, and cover up the irritating effects of nicotine, When tobacco and these additives burn, more than 4,000 different chemical components are released into the smoke. Numerous of these substances are extremely harmful and have a variety of negative health impacts.