Tobacco is deadly and addictive. It has many harming effects on your body. It elevates heart and blood pressure, as well as constricting blood vessels. It also leads to cancers such as lung cancer.
"The psychoactive ingredient is nico- tine, a stimulant, but more than 4,000 other chemicals (2,000 of which are known to be poisonous) are present in cigarettes"(Unit 5).
Someone I know used to be addicted to tobacco, for over 10 years. They were a great person, but weren't strong enough to resist the urge of smoking. They were at the point where they were constantly fearing for their lives, and experienced the loss of loved ones from related addictions. They soon realized they needed to stop. Although it was tough for them, constant withdrawals and pain from the body fixing itself, they were strong and quit on a vacation, leaving their last cigarette and a few pesos as a tip for the hotel maid.