Statin drugs lower cholesterol and lower risk of heart disease, at least for people at moderate to high risk of heart disease. However, the studies that proved this recommended that everybody eat a healthy diet, and gave half the group a statin and half the group an inactive placebo. Nobody has tested statin plus bad diet against no statin and good diet. A recent study of the Mediterranean diet showed that diet can reduce heart disease risk.
If your diet (and hopefully regular exercise) is keeping your numbers in the acceptable range (for most people, that’s less than 200 total, less than 100 LDL, greater than 45 HDL), then I wouldn’t recommend statin treatment unless you had some other reason for it, such as a history of heart attack or stroke, and possibly diabetes.
It’s also important to remember that a healthy diet reduces cancer and many other diseases. So keep up with your diet and don’t listen to your bragging friends. And if you do have to take a statin, keep up your healthy diet for the lowest heart disease risk.