The answer to this is letter A. Tobacco is known to cause 25 types of diseases. Some of these diseases are known to be deadly. This explains why people are trying to stop smoking. There are even some advertisements wherein the possible effects of smoking are shown but this is still not enough for people to just stop.
Some of the most common diseases that can be acquired by tobacco smokers are emphysema, lung cancer, and bronchitis. Take note that smokers die from smoke-related diseases but a lot of non-smokers die from these diseases too because of second-hand smoke. Some people are even saying that this is deadlier for people.