E cigarettes' tricky path as harm reduction tool WHYY Data show that e cigarettes reduce harmful constituents by 80 percent to 99.9 percent compared to cigarettes, while heated tobacco products cut key carcinogens by over 90 percent. Read then full story Top 5 favorite pro vaping pro harm reduction studies. There are tens of thousands of them, but there are my five favorite most compelling studies done on the topic of nicotine vaping for tobacco E cigarettes increase harm to smokers, so should not be promoted as a harm reduction strategy (in 10 slides) now available in 10 other languages Stanton Glantz blog