A study examining the vapor released from Blu Ecigs’ and Skycig’s e-cigarettes in comparison to the smoke emitted by Philip Morris USA’s Marlboro Gold and Imperial Tobacco’s Lambert & Butler cigarettes found that levels of harmful and potentially harmful constituents (HPHCs) in cigarette smoke were 1,500 times higher than the levels found in e-cigarette vapor.
The study—titled “Comparison of select analytes in aerosol from e-cigarettes with smoke from conventional cigarettes and with ambient air”—was published in the December 2014 issue of Regulatory Toxicology and Pharmacology. According to proponents of vapor product use, the study lends credence to the belief that, although the long-term effects of inhaling the propylene glycol and glycerin found in e-cigarette vapor are not yet known, such products provide a safer alternative to smoking combustible cigarettes.
According to the study, the e-cigarettes tested contained and delivered mostly glycerin and/or propylene glycol and water, and emitted an aerosol nicotine content that was 85 percent lower than the cigarette smoke nicotine content levels. The study also found the levels of HPHCs to be consistent with the air blanks—at <2 μg/puff—and no significant contribution of tested HPHC classes was found for the e-cigarettes tested. The e-cigarettes and combustible cigarettes in the study were tested on a smoking machine to compare the amount of nicotine delivery and the relative yields of chemical constituents.