If he smoked or other risk factors and genetics have a lot to do with health. Some are more at risk from genes, but bad lifestyle can make various illnesses sooner, worse and advance faster than those who live healthier. There is no supernatural reward for suffering now. We're all temporary conscious stardust in this time to exist, and all the elements in us will be recycled again. That's the truth that frees us from the damaging dogmas and conditional belonging. Enjoy being the universe observing itself for this short time, peace!