@flo If you take 100,000 people and have them wear sleeveless tops all summer every summer for twenty years (Group A) and take 100,000 people and have them wear long sleeve tops all summer every summer for twenty years (Group B), you will see a difference in skin cancer incidence, a higher rate in Group A than in Group B.
And if you take two groups, and they wear a top with a full sleeve on the right and no sleeve on the left, over time you will see a greater incidence of skin cancers on the left (exposed) side. and if you take a similar group and they wear a full sleeve on the left arm and no sleeve on the right, over time you will see a greater incidence of skin cancers on the right.
It isn’t sleeves or not sleeves, it is a higher amount of exposure to the sun on one side more than the other.
Cancers do not generally occur quickly, but develop over time, and from a variety of causes. Sun exposure to one side of a driver is one of many reasons for skin cancers.
You have yet to say anything about he higher incidence of breast cancer in left breasts than in right breasts.
Lung cancer isn’t picky about which lung. And colorectal and esophageal cancer are not at all incident more on one side than the other.