A person does not receive a lethal dose of toxicants from smoking only one cigarette. Instead, repeated use of cigarettes increases the risk of developing deadly diseases such as lung caricer, emphysema, and chronic bronchitis Which statement must be true?
A. Smoking cigarettes can result in death due to their chronic toxicity
B. Smoking cigarettes does not increase a persori's risk of premature death
C. Cigarettes contribute to air pollution but do not contain toxicants
D. Cigarettes have an extremely low lethal dose- 50% * (L*D_{50})