The correct answer is option 3, which states that both statements 1 and 2 are correct.

Statement 1 is true. Cigarette smoking exposes a person to benzene. Benzene is a chemical compound that is found in cigarette smoke. When a person inhales cigarette smoke, they are also inhaling benzene along with many other harmful chemicals.

Statement 2 is also true. Benzene is a known carcinogen. A carcinogen is a substance that can cause cancer. The International Agency for Research on Cancer (IARC) classifies benzene as a Group 1 carcinogen, which means it is proven to cause cancer in humans.

Therefore, both statements are correct. Cigarette smoking exposes a person to benzene, and benzene is a known carcinogen. It is important to note that cigarette smoking is a major risk factor for developing various types of cancer, including lung cancer, and benzene is one of the harmful components of cigarette smoke that contributes to this risk.