There are people out there that will tell you that cooking meats over an open flame or cooking them using wood chips is bad for your health because the fat released in the meats while cooking over an open flame released a compound called Polycyclic aromatic hydrocarbons, or PAHs- and they can cause cancer. It should be noted, however, that the research in this area is still under review, and no concrete assumptions can be drawn yet due primarily to the fact that no tests have been conducted on humans. Any research into PAHs and cooked meats are kind of all over the map, and no one can seem to come to a single conclusion.