Cancer is caused by mutating DNA. What exactly do cigarette smoke and radiation

[CoolGrl]

do that can cause cancer? Cigarette smoke and radiation both cause free radicals, which damage DNA, leading to mutation.
Cigarette smoke and radiation both cause damage to DNA, leading to mutation.
Cigarette smoke damages DNA, leading to free radicals. Radiation causes mutations in DNA.
Radiation causes free radicals. Cigarette smoke causes DNA damage.

 

[JAlves]

both damage DNA leading to mutation

 

[jameswood037]

Many people believe that smoking only causes lung cancer, which is definitely not the case. Smoking has also been linked to several other types of cancer such as cancer of the mouth, throat, stomach, bladder and colon and is also responsible for a large number of deaths from these types of cancer.