The correct answer is letter D. There are about 4,000 different types of chemicals found in tobacco products. Scientists have discovered that 43 of which are cancer-causing and can negatively affect the body in many other ways. Nicotine is the known addictive chemical in tobacco that causes a person's dependence.
That can be taken many different ways maybe: they push themselves to hard and don’t know when to take a break or they cant settle down, sleep or, don’t know when to stop.
