Sure, and the Big Mac diet doesn't cause heart attacks. I get that correlation isn't causation here, but you might be OK with saying that "certain environmental conditions" caused the cancer. But if those don't cause cancer except in conjunction with the mutation it's at least equally valid to say that the mutation "caused" the cancer. Or you can say that nothing causes cancer, and cancer is a natural process that can only be prevented by certain genetic advantages / environmental conditions.
Most of the time, it's any kind of recurring (epithelial) damage that causes a higher rate of cell replacement (which is often environmental). Just replicating the cells that many times is enough to cause mutations. It's the fact that the body doesn't eliminate the mutations that makes it cancer.