Be a good science student and ask the teacher for their references. Yes some cancers are caused by exposure to products (e.g. smoking) but there are many that have no known source or cause, e.g. many of the childhood cancers.
Man can control the probability of getting cancer by limited the risk factors such as avoiding UV rays to avoid skin cancer. But not all cancers are man made.
the only way cancer is man made is because the attitude of man causes cancer ,,,,,sorry but tobacco does not cause cancer its your attitude and health,,,its a very big misunderstanding that any chemicals produce cancer directly what the chemicals do is make the human body less efficient in fighting cancer that is in essence just cells reproducing out of control............so smoking or other products DO NOT Cause Cancer its the inability of the body to control the growing cells.........cancer can be 100 % controlled with DIET.....do you realize modern western medicine has been spending billions and billions for the last 60 years to fight cancer with very very small results.......most of the current cancer treatments kill the patient.......if your lucky surgery will get rid of it for some time.....anyway people without any exposure to any of the ""cancer ""producing elements still get cancer ......and that's many times all in all just an attitude or depression or .......
god speed
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