I have always used the philosophy that if you are in doubt you should err to caution and note something as hazardous until U know better ------ e.g. noting that the vapours given off from e-cigs probably contain a hazardous substance [as both nicotine and antifreeze can be inhaled by a user so such chemicals may be present in the vapour given off from the mouth] then as doubt is present you should err to caution

Anybody know a formal place that this philosophy is quoted as its donkeys years ago when I picked up this philosophy so I have forgotten my original source - any help would be most appreciated?

Bob

following book is worth a read if you can find -

"Precautionary Principle in the 20th Century" - by Poul Hermes ( Routledge 2002 ). A mix of health and safety and environmental cases.

M

I'd assumed the principle was thousands (if not millions) of years old.