No one has said that ecigs are 100% safe. The chief quote from certain medical people is that they are 95% safer than smoking.
PG is in a lot of products we eat or rub on our skin.
Propylene Glycol in Food: Is This Additive Safe?
Propylene glycol food list
Propylene glycol is commonly found in many packaged foods, such as drink mixes, dressings, dried soups, cake mix, soft drinks, popcorn, food coloring, fast foods, bread and dairy products ( 6 ). It is also used in injectable medications, like lorazepam, and in some creams and ointments that are applied to the skin,...
I just want to add - PG is also in most medical inhalers. For those that want to nit-pick about how it's consumed.