In houses where smokers lit up inside, the mean particle level was almost twice that of homes where smokers stepped outside. Cigarettes were the biggest contributor to high particle levels. But marijuana smoke had a large effect too — which seemed to surprise the scientists. Candles, incense, fireplaces, dusting the floor, spray cleaning products, and cooking with oil also contributed to homes with increased particle levels.

In the 14.1 percent of homes where e-cigarettes were used, the particle counts were unremarkable — which ought to be a story in itself. “We observed no apparent difference in the weekly mean particle distribution between 43 homes reporting any electronic cigarette usage and those reporting none,” wrote the authors. That was all they said about vaping.

“The aim of our research is, ultimately, to find effective ways to promote smoke-free homes and also to find good strategies, in general, for reducing exposure to household pollution,” said lead author Neil Klepeis. “The findings from our work will allow for better education and feedback to families.”

Maybe the SDSU researchers could start by educating smokers on how much less dangerous pollution is in the air in vapers’ homes, and encouraging people to switch. It’d be nice if they let Prof. Glantz — high priest of the Church of Ultrafine Particles –know too.

But don’t hold your breath. You’re not likely to hear an encouraging word about e-cigs anytime soon from pot-loving, vape-hating California. This study will be widely ignored. 

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