NOTE TO READER: You really have to read these studies. The proof is in the pudding. A lot of what they claim in the title is not there in the studies. This is one of the less convincing studies in that the data appear to have been collected properly, but the conclusions are off the chart. Chris Snowdon explains why. ---Becky Johnson, editor
by Christopher Snowden
Feb 11 2010
found online at: http://velvetgloveironfist.blogspot.com/2010/02/thirdhand-smoke-scam.html
Third-hand smoke causes cancer, study shows risks to babies and toddlers
Laboratory experiments using cellulose as a model indoor material yielded a > 10-fold increase of surface-bound TSNAs when sorbed secondhand smoke was exposed to 60 ppbv HONO for 3 hours. In both cases we identified 1-(N-methyl-N-nitrosamino)-1-(3-pyridinyl)-4-butanal, a TSNA absent in freshly emitted tobacco smoke, as the major product. The potent carcinogens 4-(methylnitrosamino)-1-(3-pyridinyl)-1-butanone and N-nitroso nornicotine were also detected. Time-course measurements revealed fast TSNA formation, with up to 0.4% conversion of nicotine.
"NNA carcinogenicity has not been reported."
"The main indoor sources of HONO are direct emissions from unvented combustion appliances, smoking, and surface conversion of NO2 and NO."
- The researchers used concentrations of nitrous acid 14 times higher than would be found in a normal environment
- Even at the unrealistic levels found in the experiment, there is no evidence that such doses are harmful to humans
- The main TSNA produced is not a carcinogen
- The weakest results were found in the real-life conditions, with measurements barely exceeding detectable levels in the smallest conceivable workplace of a heavy smoker
- Any effect from the TSNAs is negligible compared to the effects of the nitrous acid itself