Different cooking oils have different smoking points, giving them different optimum heating temperatures for different cooking methods. Unsaturated oils are healthier choices for cooking. However, when unsaturated oils are used in deep frying, they may turn toxic which leads to an increased cancer risk. For light cooking and salad dressings, look to polyunsaturated oils like Sesame oil or Safflower oil. For stir-frying, choose oils with a higher amount of monounsaturated fats like Canola oil.