I know e-cigs are safer then smoking ,i don't think they are safe in the long run.
take a pipe cleaner and run it up and down the air tube of a clearomizer after you have vaped a
tank full and you will see the dark gunk that it picks up,,now that is going in to your lungs.
now you decide,don't beat me up on this or tell me it is water vapor,,use a little common sense.
i have used e-cigs since 5-27-12 and i still have lung problems,of coarse i smoked for 52 to 54 yrs. so it is understandable .
also remember that food grade is for ingestion not inhalation ,,i am hooked on
vaping but i don't crave it like i did the cigarettes.