NicoBloc traps up to 99% of the tar and nicotine normally inhaled when smoking filter cigarettes. This enables smokers to wean themselves off nicotine to aid in giving up cigarettes. NicoBloc does not make cigarettes safe only less harmful. There are many other chemicals including carbon monoxide that are still present in the smoke taken into the lungs. The only way to avoid all the noxious chemicals is not to smoke.