Heck, I first heard it in the '70s. Also grilled (barbecued) meat can contain carcinogens.

Like with contaminated fish or vegetables, eat a moderate and varied diet. Wash your fruits and veggies before eating (you can also rinse off meats). And be sure to get the internal temperatures of meats to the correct level -- you might love steak tartare, but you won't like the gift Sam 'n' Ella brings.