Question

what is cancer ??
please give a right answer.
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Answer 1

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cancer is a disease ❤️

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Answer 2

The substances that cause cancer are called carcinogens. A carcinogen may be a chemical substance, such as certain molecules in tobacco smoke. The cause of cancer may be environmental agents, viral or genetic factors.

We should bear in mind, though, that in the majority of cancer cases we cannot attribute the disease to a single cause.

We can roughly divide cancer risk factors into the following groups:

biological or internal factors, such as age, gender, inherited genetic defects and skin type

environmental exposure, for instance to radon and UV radiation, and fine particulate matter

occupational risk factors, including carcinogens such as many chemicals, radioactive materials and asbestos

lifestyle-related factors.

Lifestyle-related factors that cause cancer include:

tobacco

alcohol

UV radiation in sunlight

some food-related factors, such as nitrites and poly aromatic hydrocarbons generated by barbecuing food).