If any and all exposure is cancer causing why did it not make the chart as a leading cause?
Here is the full blown study that answers all our questions. This breaks down the levels by OSHA via direct exposure over a 40 hour work week or 8 hour day
Look at the chart after each chemical breakdown.
1 is the maximum airborne concentration below which it is believed nearly all individuals could be exposed up to one hour without experiencing other than mild transient adverse health effect or precieving a clearly defined objectional odor.
http://www.epa.gov/ttnatw01/urban/natpapp.pdf
200 something pages. Tobacco burning is listed as potential suitors for a small handful of cancer causing agents. However if you look at the OSHA chart representing a 40 hour work week of exposure the amount of concentrated exposure on each one listing tobacco burning as a source is up in the 100X category for almost all of them.
So as far as OSHA is concerned any chemical with the ability to cause cancer associated with tobacco burning would have to expose the average person in a concentrated area 100X the basic mg amount an hour over a 40 hour work week. Thats a pretty profound chart don't you think?
The only chemical that even comes close (10 times the base amount in a concentrated area) is further down the list and the main culprit is diesel fuel however it lists a potential source of tobacco burning as well.
So as far as the EPA is concerned its bad but the exposure as far as OSHA is concerned is 10-100 times the base amount in a concentrated area over a normal 40 hour work week.
I think I've found my answer. If you can't read or understand the chart I'm sorry but this clearly defines the levels of acceptable carcinogens from cancer causing agents that are air-bourne.
So really there is an argument to be made over the concentration of exposure vs. just any exposure. As far as I'm concerned there is no concern of cancer being caused unless you're exposed at a minimum 10X the base amount an hour for a 40 hour work week like diesel fuel or 100X times the amount similar to a wood buring stove over the same period of time.
Your people and its their study.