Why Do Some People Often Not Believe That Their Present

Why do some people often not believe that their present day habits and exposure to carcinogens will lead to cancer?

A) Most mutations of carcinogens cause no harm.
B) Carcinogens do not cause pain until the very last stages.
C) Initial exposure to a carcinogen and the appearance of detectable cancer symptoms has a 10- -40-year time lapse.
D) Most carcinogens are found in highly addictive substances.
E) Carcinogens cannot be seen or touched, and therefore, people do not think about their impact.