It is up to you whether you want to start the fire with toxic elements or not. Usually, since toxins are incredibly harmful to your health and our ecology in general, developers make firestarters from natural materials like wood and wax. Though some of them are not as flammable as the logs covered with toxic elements, they are not dangerous for your health. We are talking about the food here, and I strongly recommend avoiding any firestarters that contain toxins since such products can transfer them into your food.
If you believe that these logs may be dangerous, you have to avoid them.