I have no answer, but I would say this (this was my rationale). E-cigs are probably worse for you than, say, regular air. So if you are deciding between e-cigs and just air (as in a nonsmoker) then don't do it.
Now if you are deciding between e-cigs and analogs, what are the odds that vaping e-cigs could possibly be any WORSE for you than inhaling the fumes of combustion-driven, unregulated-likely-filthyandstale tobacco (plus god knows what else), fiberglass filtered proven-can-kill-you and says so on every pack products.
That you must decide for yourself.
Now if you are deciding between e-cigs and analogs, what are the odds that vaping e-cigs could possibly be any WORSE for you than inhaling the fumes of combustion-driven, unregulated-likely-filthyandstale tobacco (plus god knows what else), fiberglass filtered proven-can-kill-you and says so on every pack products.
That you must decide for yourself.