THS exposes people to mixtures of chemical compounds in gas phase and particulate phase similar to those contained in mainstream smoke
and SHS, as well as to additional products of surface reactions involving tobacco smoke constituents.
The particles of SHS tend to be smaller, and therefore stay airborne longer than mainstream smoke
This type of smoke contains more toxins and nicotine than mainstream smoke
328) Although noting that the "physiochemical nature" of ETS differed from that of mainstream smoke
, the Committee pointed out that ETS contained many of the same toxic chemicals as mainstream smoke
According to the American Lung Association, side-stream smoke contains more tar, nicotine and carbon monoxide than mainstream smoke
Research shows that more deleterious components are released into the environment with sidestream smoke than with mainstream smoke
Partly because ETS consists of the same carcinogenic chemicals found in mainstream smoke
(inhaled by the smoker), the report concludes that ETS can itself be classified by the EPA as a "Group A" carcinogen along with arsenic, asbestos, benzene and radon.
, filtered through the cigarette and inhaled by the smoker, is highly concentrated; the toxins it contains occur in comparatively large particles.
ETS contains many of the toxic agents and carcinogens that are present in mainstream smoke
, but in diluted form.
contains over 4000 identified substances, approximately 4 dozen of which are carcinogenic.
As expected, the mainstream smoke
-- the portion inhaled by the smoker -- collected from low-tar cigarettes induced 20 to 30 percent fewer mutations per mg of pollutants in the test system's growing bacteria than did mainstream smoke
from the high-tar brand.
Nonsmokers are also exposed to mainstream smoke
after the smoker exhales it.