I believe that it was EleanorR who pointed out the risks of diacetyl substitutes such as acetoin and acetyl propionyl but it was Cherie Pie who posted a response from Clark (with permission) confirming that Nicoticket custards acetyl propionyl (2,3 pentanedione) and acetoin (acetyl methyl carbinol). Yet this disclaimer continues to appear on the Nicoticket site: 
"FEMA & GRAS approved, diacetyl free, natural and artificial flavoring"
Unless something has changed very recently it is my understanding that it is not possible to make custard vapes that avoid all risk of exposure to diacetyl. While I tend to favor a libertarian view on what adults put in their bodies I am not a fan of any vendor who sells custard vapes and chooses not to prominently disclose this information to their customers.
From The Perfumer's Apprentice, aka The Flavor Apprentice (TFA), site
I have been doing more research, and i discovered that the molecule Acetoin can under certain circumstances "catalyze" into containing minute traces of the molecule Diacetyl.
...
I then had a sample of Acetoin purchased from Vigon International analyzed by GC/MS and yes, it did have trace amounts of Diacetyl! When I looked at the online specification sheet that Vigon posts, it does show that the purity of that particular product is 93-100%. Nearly every molecule that is commercially sold is somewhere in this range for purity, and this seems to be an acceptable industry standard. (Vigon is a very reputable company!)
...
But for customers wanting to avoid even trace amounts of Diacetyl, this means that any flavor that contains the ingredient Acetoin can potentially also contain trace amounts of Diacetyl, even though Diacetyl itself was never added to the blend as an ingredient.
...
Of course, if only a small amount of acetoin is in a flavor, then the potential likelihood of there also being diacetyl is very very small.
Short of it being possible for custard vapes to be made without risk of diacetyl exposure or other known nasties I'm not holding my breath waiting for any Ahlusion custard vapes.
Before I knew of the risk of diacetyl exposure from replacement ingredients I tried quite a few custard vapes. They all had a chemical taste to me, including Nicoticket's custard and crème brûlée.
"FEMA & GRAS approved, diacetyl free, natural and artificial flavoring"
Unless something has changed very recently it is my understanding that it is not possible to make custard vapes that avoid all risk of exposure to diacetyl. While I tend to favor a libertarian view on what adults put in their bodies I am not a fan of any vendor who sells custard vapes and chooses not to prominently disclose this information to their customers.
From The Perfumer's Apprentice, aka The Flavor Apprentice (TFA), site
I have been doing more research, and i discovered that the molecule Acetoin can under certain circumstances "catalyze" into containing minute traces of the molecule Diacetyl.
...
I then had a sample of Acetoin purchased from Vigon International analyzed by GC/MS and yes, it did have trace amounts of Diacetyl! When I looked at the online specification sheet that Vigon posts, it does show that the purity of that particular product is 93-100%. Nearly every molecule that is commercially sold is somewhere in this range for purity, and this seems to be an acceptable industry standard. (Vigon is a very reputable company!)
...
But for customers wanting to avoid even trace amounts of Diacetyl, this means that any flavor that contains the ingredient Acetoin can potentially also contain trace amounts of Diacetyl, even though Diacetyl itself was never added to the blend as an ingredient.
...
Of course, if only a small amount of acetoin is in a flavor, then the potential likelihood of there also being diacetyl is very very small.
Short of it being possible for custard vapes to be made without risk of diacetyl exposure or other known nasties I'm not holding my breath waiting for any Ahlusion custard vapes.
Before I knew of the risk of diacetyl exposure from replacement ingredients I tried quite a few custard vapes. They all had a chemical taste to me, including Nicoticket's custard and crème brûlée.
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Although I would love to see if Wlad could make a Vanilla Boba Tea . . . 