i smoked 2 packs a day until i switched to e cigs.
you have to experiment with a few different ones until you find the right one but these things are amazing.
as a heavy smoker i had to get one with some major "horsepower" but once i did i just found myself smoking less cigs a day while using the ecig more and more.
this is the one i use and my favorite liquid.
the main ingrediant in these things is propylene glycol which is used in basically everything and is recognized as generally safe by the fda.
Upon reviewing the available toxicity information, the Agency has
concluded that there are no endpoints of concern for oral, dermal, or
inhalation exposure to propylene glycol and dipropylene glycol. This
conclusion is based on the results of toxicity testing of propylene glycol
and dipropylene glycol in which dose levels near or above testing limits
(as established in the OPPTS 870 series harmonized test guidelines)
were employed in experimental animal studies and no significant toxicity
observed."
"Carcinogenicity Classification
A review of the available data has shown propylene glycol and
dipropylene glycol to be negative for carcinogenicity in studies conducted
up to the testing limit doses established by the Agency; therefore, no
further carcinogenic analysis is required."
http://www.epa.gov/oppsrrd1/reregistration/REDs/propylene_glycol_red.pdf
They determined that inhaling Propylene Glycol in levels which
were significantly higher than would be common under any
circumstances did not have any ill effects on the monkeys used for
the study. The only significant effect they noted was weight gain.
http://www.time.com/time/magazine/article/0,9171,932876-2,00.html
"The report of the 3 years' study of the clinical application of the
disinfection of air by glycol vapors in a children's convalescent home
showed a marked reduction in the number of acute respiratory infections
occurring in the wards treated with both propylene and triethylene
glycols. Whereas in the control wards 132 infections occurred during the
course of the three winters, there were only 13 such instances in the
glycol wards during the same period.
http://ajph.aphapublications.org/toc/ajph/36/4
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