is cancer on the rise or has it always been prevelent

i sometimes wonder whether they are poisoning our food and drink supply, to cause more cancer in the population?

should i be worrying about this or is there no need to worry?

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SunshineGirl · 36-40, F Best Comment

Poor diet and environmental pollution may be accelerating some forms of cancer. You can reduce your chances of contracting cancer, or enhance your ability to fight it, by exercising more and cutting out highly processed food.