That strongly contradicts your main argument that second hand smoke does not raise the risk of cancer. As for the mechanisms by which environmental tobacco smoke induces that higher risk, is there really any point in quibbling here whether it is one single component of tobacco smoke or, as I suggest, an effect of the combination of chemicals present?
There never was any risk.............that’s the point and the point OSHA made about the studies being useless.
OSHA / NIOSH RESEARCH
In 1991 NIOSH { OSHA’ research group} Looked into ETS although at the time they recommended reducing ETS exposure they found the studies lacking.
NIOSH recognizes that these recent epidemiological studies have several shortcomings: lack of objective measures for charachterizing and quantifying exposures,failures to adjust for all confounding variables,potential misclassification of ex-smokers as non-smokers,unavailability of comparison groups that have not been exposed to ETS, and low statistical power.
Research is needed to investigate the following issues:
1. More acurate quantification of the increased risk of lung cancer associated with ETS exposure,including determination of other contributing factors[e.g.,occupational exposures]that may accentuate the risk.
2.Determination of the concentration and distributuion of ETS components in the workplace to help quantify the risk for the U.S. working population.
a.The association of ETS exposure with cancer other than lung cancer
b.The relationship between ETS exposure and cardiovascular disease
c.The relationship between ETS exposure and nonmalignant resporatory diseases such asthma,bronchitis and emphysema, and
the effects of ETS on lung function and respiratory systems
c. Possible mechanisms of ETS damage to the cardiovascular system,such as platelet aggravation,increased COHb leading to oxygen depravation,or damage to endothelium
d.Effects of workplace smoking restrictions on the ETS exposure of nonsmokersand ETS-related health effects in nonsmokers
After ten years of no conclusive research and lack of studies that didn’t eliminate the bias OSHA decided that the studies did not have substance and here is there present policy.
Environmental Tobacco Smoke (ETS)
Because the organic material in tobacco doesn’t burn completely, cigarette smoke contains more than 4,700 chemical compounds. Although OSHA has no regulation that addresses tobacco smoke as a whole, 29 CFR 1910.1000 Air contaminants, limits employee exposure to several of the main chemical components found in tobacco smoke. In normal situations, exposures would not exceed these permissible exposure limits (PELs), and, as a matter of prosecutorial discretion, OSHA will not apply the General Duty Clause to ETS.
OSHA finally makes a statement on shs/ets :
Field studies of environmental tobacco smoke indicate that under normal conditions, the components in tobacco smoke are diluted below existing Permissible Exposure Levels (PELS.) as referenced in the Air Contaminant Standard (29 CFR 1910.1000)…It would be very rare to find a workplace with so much smoking that any individual PEL would be exceeded.” -Letter From Greg Watchman, Acting Sec’y, OSHA
the 4700 compounds is theoretical even on OSHAs part. As they have never identified and trapped more than about 800 actual chemicals and they cant even trap those everytime as they are so small they can barely be measured.