FINALLY! CITES! After only four pages of them being constantly asked for! Now lets take a look at what they say.
From the third cite:
“The study, thought to be the first to assess levels of a nicotine byproduct known as cotinine in nonsmokers exposed to second-hand smoke outdoors, found levels up to 162 percent greater than in the control group.”
Cotinine is a marker for exposure, used because it lasts in the body longer than nicotine does thus is an easier to find indicator. A smoker typically has levels up to 3000 percent higher than non-smokers not exposed to second hand smoke. A non-smoker exposed to second hand smoke indoors, at a restaurant before indoor smoking bans for example, has cotinine levels of 500 to 1000 percent higher. So while 162% sounds scary, it is far less than it sounds like.
It should be noted that even a control group with no exposure will have up to 10ng of cotinine. So while 162% sounds horrible, we’re talking the difference between 16ng and 10ng here. Six nanograms is pretty small and rather close to the possibility of insignificance or measuring error.
Lets move on and look at the first link:
“However, during smoking, OTS levels outdoors may be as high as SHS indoors”
Well, if your other link is to be believed, no, it doesn’t. So your cite for supporting the dangers of outdoor second hand smoke can’t even agree on what levels of smoke you’re exposed to. Hardly an indication of conclusive proof outdoor smoking causes harm.
As for the second cite:
“We were surprised to discover that being within a few feet of a smoker outdoors may expose you to air pollution levels that are comparable, on average, to indoor levels that we measured in previous studies of homes and taverns,”
How many non-smokers who find cigarette smoke repulsive stay within a few feet of a smoker outdoors? Also note, again, the claim it is comparable on average to indoor levels is directly contradicted by your third cite. Since the other cite provided real numbers instead of ‘comparable, on average…’ vagueness, I’m inclined to believe that other study.
It goes on to say
"“For example, if you’re at a sidewalk café, and you sit within 18 inches of a person who smokes two cigarettes over the course of an hour, your exposure to secondhand smoke could be the same as if you sat one hour inside a tavern with smokers.”
How many non-smokers who hate cigarette smoke sit a foot and a half from a smoker for an hour? Really now, for those who don’t like cigarette smoke, are you seriously going to sit that close while a smoker puffs away when you’re outdoors and have the option of moving away?
The second cite also mentions a 2006 Surgeon Generals report. I looked up that report. In fact, here is the reports executive summary. It says “people are exposed to secondhand smoke at home, in the workplace, and in other public places such as bars, restaurants, and recreation venues”. In other words, your second cite references a report about indoor exposure rather than outdoor exposure which is what we’re talking about.
The other two studies I accept. While there are issues between their conclusions, as I mentioned, that can be a honest difference in the studies. But this one? It’s assumptions have nothing at all to do with the situations this thread has been talking about. People are complaining about passing a smoker while on a stroll, and you’re citing a study about sitting 18 inches from a smoker for an hour as proof? This study appears to be pretty obviously biased by using unrealistic scenarios and misrepresenting other reports it references.
Since you have provided cites, and honestly, thank you for that, I’d like a cite on what the health effects of outdoor second hand smoke exposure is. We have studies showing 300ng of cotinine is a high risk, that’s smokers themselves. We have studies showing 50 to 100ng of cotinine is a risk, that’s indoor second hand smoke exposure. We know up to 10ng is not a risk, that’s the control group. So please, show me where 16 ng, something numerically far closer to the control group than it is to previously studied exposed groups, is a significant increased health risk.