Just a note about diacetyl:
I repeat myself from thread to thread about this:
The whole diacetyl thing... if that would be a problem, you'd be dead already if you ever smoked cigarettes.
Cigarettes has THOUSANDS of times more diacetyl and every other chemical that the witch hunt is using to scare people with. But you don't hear that in the news, do you? Ever heard of a single smoker getting popcorn lungs?
What started it all? It was the court case of the pop-corn factory, where the word diacetyl was "THE" magic word that the lawyers used over and over, and even with NO scientific proof that it was the "guilty" chemical, (and not the other dozens of other chemicals these people inhaled at extremely high levels, plus the fact that they were heavy smokers), the word stuck and any mention of it is an instant association to the pop-corn lung scenario.
Every thread about "diacetyl" is people with the same fears that the lies and propaganda has proven to have worked on them.
There is nothing, not one thing so far, after over 10 years, that has been showed, reported, etc. to be any sort of recognized and proven health issue with vaping. There is yet to be a single proven and solid scientific result about it causing any harm at all and it's been around in food for decades.
Every case of anything relating to popcorn lung or such is always linked to studies and such that always state the word "possible" and usually include a huge lists of other possible chemicals, circumstances, etc. Not a single conclusive confirmation. The only thing in common that I've seen/read about about anyone that suffered from this is that they smoked a lot and were exposed to a lot of chemicals at extremely high levels.
Not one... nope, not a single person admitted to the hospital, treated, found to have any ailment from anything that has to do with vaping.
Worse than that, I've seen that there's been some studies lately that are being worked on that are showing possibilities that vaping is actually helping people fight lung infections, so on top of everything, vaping might actually be healthy for you.
The only bad press vaping gets, has only been the stupid people that did not respect lithium batteries and the OHM laws (shorting out their batteries, causing them to vent/explode) or just plain extreme bad luck, as per cell phones/tablets/laptops exploding on people just the same.
What's in vaping liquid, unless you're getting it in an alley in the back of a truck, there should never be more than 4 things... PG, VG, flavouring, nicotine, the last two being optional, all of them tested and used for decades and proven to have absolutely no ill effect, unless the person has a sensitivity (allergy) to it... and even then, it's just a bit of an irritation, yet to hear anything more than a discomfort or such.
Now I'm not saying that it's impossible that something could have some effect in time, but at this point, it's simply been blown out of proportion. We have thousands of vapers that's been vaping for close or over 10 years with not a single health issue relating to their vaping and the content of the liquids..