what harm can a vegetable oil do you?Quite a lot if breathed in. There is a lung disease similar to silicosis which used to affect machinists. They would clean their machines eg metal working lathes with high pressure air lines and this created an aerosol of oil and also oil & water (called suds, used as a cutting lubricant). Breathed in this aerosol coats the lungs and causes breathing problems.
Not sure what in the so called vapour in vaping. As you say, we haven’t had 20 years of guinea pigs testing it!
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