This writer’s four year old son died of cancer and nobody could tell me why. This is much like question 2,3 and 7. There is no specific answer that I can give.
I have to say that many of our modern sicknesses are self inflicted. To eat too much and get too fat is dangerous and smoking is too. I only recently learnt that smoking can eventually cause you to lose a foot or a leg or make you blind. It squeezes blood vessels smaller and cuts circulation of blood.
Chemicals in our food = I avoid. Fruit, to me 60 years ago, was wonderful and tasty. Now it seems to me mostly tasteless. The soil is depleted and chemical fertiliser does not help earthworms and bacteria that make the soil good.
The Bible tells us to only have sex with your wife or husband. But, we think we know better, and pay a heavy price in six or eight diseases, some of which can make you sterile.