There is a chemical in many flavors and (not most oils) (misplaced the name) that varies by flavor in concentration that will react with many plastics that
tanks are made of.
Partial list of flavors:
All are TFA
(However this chemical is not limited to TFA flavors)!
Cinnamon
Cinnamon Red Hots
Cinnamon Red Hots Concentrate
Cola
Cola Concentrate
Root Beer / Root Beer Float
Of course then there is the list that was refereed to that shows "know crackers"
Some flavors like Sweet Orange have a similar reaction, but it is not due to the chemical in Cinnamon or Cola and many others; it is the essential oil itself that causes the plastics to crack or in some types of plastic it will actually melt.
The Cinnamon Red Hots concentrate and Cola concentrate are so reactive with plastics they are shipped in metal bottles!
As Bill said Menthol is NOT reactive.
Now as far as "known crackers" I personally like Garlic Herb Triscut ...LOL
(sorry I couldn't resist).
A great test tool for a flavor or mix is get an Evod bcc tank (pretty inexpensive) and adapter if necessary for 510 and vape as usual, it won't take long to show it's reacting...these usually start to melt!
Then reason the bottles don't melt (the flavor bottles) is because they usually are a type of PVC which is highly resistant to reacting with chemicals.
(As mentioned though "special" more resistant bottles are used with Cinnamon and Cinnamon Red Hots, etc.).
I am fairly sure that Polycarbonate is the plastic (polymer) that will crack as opposed to melt.
When I find the chemical name I will follow up with a post naming the culprit and a list of know reactions with various plastics.
This is a big reason I have just switched to glass or SS
tanks where I can!
Fire and Ice was my daily mainstay vape for virtually years, and of course Peachy Menthol.
(Old PS flavor mixes...goes back about 5 years)!
Also Fire and Ice can be similar to Firecracker, that is to say it is Cinnamon Red Hots with Menthol as opposed to Cinnamon and Menthol so depending on your recipe one can be more reactive than the other.....