It possibly is one of the main causes ofcancer. Over 4000 natural and man-made chemicals have been found in tobacco. Many are endocrine interuptors and interfere with sexual function as well as masculine and feminine traits. Nicotine is also known a a pesticide and will kill many small organisms. Think about alcohol consumption.
Urethane is present in alcoholic beverages.
It would seem ludicrous to eat urethane insulation but alcoholic beverages have the same effect. You have many choices to make now that will affect your future health. This can only be done with knowledge gained from the sources you trust. Minimize your purchase of clothes that have to be dry cleaned. Clothes that are dry cleaned should not be worn next to the skin if possible.