Ok, so this happened about 6 years ago but I thought I would share. This was before I did any diy liquid, and was simply trying to buy eliquid in larger quantities to save money. At the time you could only buy bottles in 10ml ...for $10. I found a website where I could purchase by the litre!! Oh joy!!
I got 1L of Canadian tobacco, and 1/2L of menthol.
The tobacco one was ok, 60/40 24mg.
The menthol one didn't have the nic strength or the pg/vg % on the bottle. Oh well I thought, I'll give it a try.
Loaded up a shitty old ce4 clearomizer (fine gear at the time). Sat back to relax with a nice menthol vape. As I took my first draw I noticed something was wrong. My lung started to feel cold, I stoped inhaling and blew out the vapor....I could feel it behind my eyes!!! It was like EXPERIENCING menthol. Hard to describe but, exerything was menthol! Each breath I took for five minutes after, was pure menthol. It was HORRIBLE!
I had purchased menthol flavouring, not e-liquid.
Lesson learned....don't be an idiot.