Let’s consider one of the toxins in SHS, that is ARSENIC.

Arsenic can be a deadly poison. The EPA and FDA set levels on the amount of arsenic that can be in the water we drink and the food we eat.

The EPA level for arsenic in drinking water is 10 ppb.
The FDA limit for arsenic chicken is 500 ppb.
The FDA limit for arsenic in eggs is 500 ppb.
http://www.atsdr.cdc.gov/HEC/CSEM/arsenic/standards_regulations.html

10ppb allows for 10 nanograms(billionths of a gram) of arsenic to be present in one gram of “safe” drinking water.

500 ppb allows for 500 nanograms of arsenic to be present in one gram of “safe” chicken or egg.

10 nanograms per gram equates to about 2,500 nanograms for an eight-ounce glass of water.

500 nanograms per gram equates to about 250,000 nanograms for one pound of chicken breast.

500 nanograms per gram equates to about 250,000 nanograms for one pound of eggs

According to a study done for the Mass. Dept of Public Health, the total smoke output(both mainstream and sidestream) for an average cigarette contained 32 nanograms of arsenic.
The 1999 Mass. Benchmark Study. Final Report 07/24/00

The amount of allowable arsenic in a the recommended eight glasses of water a day is about equal to the total amount of arsenic in 32 packs of cigarettes, or 640 cigarettes.

The amount of allowable arsenic in one pound of chicken or eggs is equal to the total amount of arsenic in 400 packs of cigarettes, or about 8,000 cigarettes.

We consume 81.2 pounds of chicken per year; this is equal to the total arsenic in the smoke of 649,000 cigarettes per year or 1,780 cigarettes per day.
http://www.healthobservatory.org/library.cfm?refid=80529

We consume 251 pounds of eggs per year. This is equal to the total arsenic in the smoke of 2,008,000 cigarettes per year or 5,501 per day.
http://www.infoplease.com/ipa/A0104742.html

The total allowable, safe, arsenic in our diet from water+chicken+ eggs per day is equal to the arsenic in the total smoke output of 7921 cigarettes per day.

That comes to about 330 cigarettes per hour, 24 hours a day.

Just do not let anyone else breathe any of the smoke, there is no safe level of exposure to it.

The only thing I'd add, or ask rather, is if there's a difference between inhaling arsenic and swallowing it?

That is your assignment if you're willing.

Actually, I think not.

Consider Flu Vaccine, you can use an inhaler or you can get a shot. Both work or so we have been told.

Antis would have us believe this anyway. They say that smoking causes Heart Disease. To my knowledge,no one has ever taken their heart out and blown cigarette smoke on it.