Heart disease seems to be mostly caused by high cholesterol, which most people (somewhat correctly?) see as being caused by eating unhealthily and not exercising. So I bet people see heart disease as somewhat being "your fault" if you don't eat right, etc. On the other hand, there are some environmental causes to cancer but it's not such a cause-and-effect relationship. People are invariably more frightened of things they have no control over. (airplane crashes versus car crashes)
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Heart disease seems to be mostly caused by high cholesterol, which most people (somewhat correctly?) see as being caused by eating unhealthily and not exercising. So I bet people see heart disease as somewhat being "your fault" if you don't eat right, etc. On the other hand, there are some environmental causes to cancer but it's not such a cause-and-effect relationship. People are invariably more frightened of things they have no control over. (airplane crashes versus car crashes)