Do you think chemotherapy is a scam?

Someone here had a theory that chemotherapy is a scam and only serves to murder people while stealing their money. They found it appropriate to block me for having rational doubts, so I'm going to ask what everybody else thinks. Of course if you have an opinion that differs from what is generally accepted by the entire world, solid facts would be appreciated to back it up.

Personally I'm in Canada where healthcare is absolutely free and chemotherapy is widely used, so I'm under the impression that the logic of it doesn't really stand. And I also know several people for whom the treatment has worked.
Yes, it's a scam
No, it's a valid treatment
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Do you think chemotherapy is a scam?
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