500
There are how many known known substances in cigarette smoke. a) 4,000 b)1,000 c)500 c) 900
It is estimated that there are more than 4,000 chemicals in tobacco smoke and at least 50 of them are cancer producing. Most of the toxic chemicals of cigarette smoke, including carbon monoxide, benzene, formaldehyde and hydrogen cyanide, are created when tobacco burns. Others such as lead, nitrosamines and nicotine are found naturally in unburned tobacco but are released as it burns. Health Canada requires manufacturers to test and report on 43 chemicals found in smoke – including the six now listed on packages.