You seem to think that science do not have the ability to predict the effects from causes, it is possible to say if vaping is safer than normal cigarettes now

You seem to think that science do not have the ability to predict the effects from causes, it is possible to say if vaping is safer than normal cigarettes now itself, rather than have to wait for 50 years to make that declaration. Theoreticaly ecigs are much much safer, due to the lack of combustion and presence of carcinogenic smoke components.