We’re all around electronic equipment for our entire lives. Plus, we are exposed to a number of other radiation sources, such as solar radiation.
Furthermore, cancers caused by radiation are usually skin cancers (caused by UV exposure) or blood cancers. Exposure to radon is associated with lung cancer because the radon is inhaled into the lungs.
With cigars (or any smoked tobacco product), a mixture of carcinogens is brought into the body, where they have contact with mucous membranes and are absorbed into epithelial cells. Even if the cigar smoke is only intentionally inhaled into the mouth, a considerable portion of it is still inhaled into the lungs through the smoke that the cigar emits into the surrounding air while it is burning.