The scientific literature supporting the conclusion that filtered cigarettes are associated with a lower cancer risk than non-filtered cigarettes is substantial. I will not present the entire literature, but here are some representative studies:

As by the Campaign for Tobacco-Free Kids: "overall youth smoking declined significantly in 2013, and smoking rates fell to record lows for all three grades surveyed (grades 8, 10 and 12). This is the third year in a row that this survey has found a significant annual decline in youth smoking, which is highly encouraging after several years in which progress had nearly stalled. For all three grades combined, the percentage of students who reported smoking cigarettes in the past month fell from 10.6 percent in 2012 to 9.6 percent in 2013. Smoking declined from 17.1 to 16.3 percent among 12th graders, from 10.8 to 9.1 percent among 10th graders and from 4.9 to 4.5 percent among 8th graders. The declines were statistically significantly for 10th graders and for all three grades combined."

Why?

"Similarities are evident between advertisements for the e-cigarettes of today and the cigarette ads from the 1950s. For example, both sets of ads use celebrities to appeal to their target audiences."

2. Propylene glycol and/or glycerin

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