The human body is a machine that breaks down if abused.
I read in the Daily Mail today how a man committed suicide after three months of persistent ringing in his ears known as tinnitus. This man had attended a heavy metal concert with noise so loud it damaged his ears.
Ears are delicate organs which are not designed for large scale noise like heavy rock concerts, it was inevitable that placed under enough stress they would break down.
This scenario can also apply to any organ of the body: lungs not for tobacco; liver not for alcohol; brain not for drugs.
Human bodies are machines that operate if maintained well, but if abused break down.