True or false? except for the clear link between smoking and lung cancer, most chronic diseases cannot be attributed to a single cause.

The given statement is true.  

The majority of the chronic diseases are not accredited to a single cause, some of the poor lifestyle choices like overuse of alcohol, smoking, lack of physical activity, poor diet, and insufficient relief of chronic stress are the major contributors in the advancement and development of preventable chronic ailments, like type 2 diabetes, obesity, cardiovascular disease, hypertension, and many kinds of cancer.  

what is this saying?