Getting cancer is like winning the lottery, and every time you go out in the sun, use a cleaning product, get an X-Ray, take an intercontinental flight, eat a b

Getting cancer is like winning the lottery, and every time you go out in the sun, use a cleaning product, get an X-Ray, take an intercontinental flight, eat a banana, etc. you get a varying number of tickets. Unlike a lottery, once you finally "win" it's virtually impossible to figure out which ticket was "lucky". To do a controlled study on humans you'd need those humans to record an impractical amount of information about their day-to-day actions over their entire lives. This isn't going to happen anytime soon. To make matters worse, humans also use sunlight to synthesize Vitamin D, and low levels of Vitamin D are also correlated with cancer. So... Too much UV gives you cancer and too little can give you cancer if you don't get enough Vitamin D in your diet, which might also give you cancer. Okay... So use mice. Do mice respond exactly the same way to everything as humans? No... Probably not... Medical science is a bit like trying to figure out how to build the ultimate F1 car on a budget that only lets you work with Lada's.