Have been an e-cig user for about 2 years now and not smoked an “analogue” since.
I only buy e-liquid from reputable UK suppliers who show traceability and quality of the ingredients they use (unlike Chinese factories who may well not use food grade ingredients, clean room preparation ect)
The research will take time and will most likely result in weighted opinions rather than plain facts, the reason being is that the anti smoking health groups are largely funded by the Pharmas and they don’t want e-gics ruining their patches, gums, sprays market. The other side of this is the big tobacco companies and their lobbying power at goverment level to continue to allow cigarettes to be sold (and treasuries to reap the tax revenues).
A great, unpatented, open source invention, that gives nicotine users a safe(r) way to enjoy their fix, just like coffee or alcohol, in moderation, doesn’t stand a chance against these industrial giants