"And in some cases LOWER than other NRT products" refers..
"The differences between vapers and smokers were dramatic, ranging from 57 percent reductions in three volatile organic compounds (ethylene oxide, acrylonitrile, and vinyl chloride) to 97 percent reductions in acrylonitrile (another VOC) and in a tobacco-specific nitrosamine, a potent carcinogen. The levels for vapers were at least as low as those for NRT users and in some cases lower, which is striking because NRT * is widely accepted as a safe alternative to cigarettes."
*NRT - Nicotine Replacement Therapy; (Patches, Gum, Lozenges etc.)
http://reason.com/archives/2017/02/15/study-confirms-health-advantages-of-vapi
"The differences between vapers and smokers were dramatic, ranging from 57 percent reductions in three volatile organic compounds (ethylene oxide, acrylonitrile, and vinyl chloride) to 97 percent reductions in acrylonitrile (another VOC) and in a tobacco-specific nitrosamine, a potent carcinogen. The levels for vapers were at least as low as those for NRT users and in some cases lower, which is striking because NRT * is widely accepted as a safe alternative to cigarettes."
*NRT - Nicotine Replacement Therapy; (Patches, Gum, Lozenges etc.)
http://reason.com/archives/2017/02/15/study-confirms-health-advantages-of-vapi