Suggestion:
Frame the statistics in terms of the two-year quit mark. For big pharma NRTs, the success rate is only 2%, while cold turkey is something close to 10%. As Dave said, the quit rate for vaping is at or above 80%. There is a study floating around out there which quoted the average of 9 unsuccessful attempts to quit smoking, using big pharma NRTs, before the interviewees ever tried vaping.
There are several studies out there which have explored the health benefits of nicotine--including the prevention of Parkinson's, Altzheimer's and ulcerative colitis. Other prevented maladies exist.
The New Zealand study on Ruyan products showed that less than 2% of the produced nicotine remains in exhaled vapor.
All these documents can be found at the ECF link above, or over at:
Medical/Health and Safety - Vapers Forum