Based on the preliminary results of Dr.F's flavor study, the diacetyl debate is about to not only continue, but it may get heated. A high percentage of liquids tested were shown to contain these properties and even from vendors that claim to be free of those chemicals. I think we may see some surprises from this study and I wouldn't place any bets on which vendor is "free" of these properties. This is not the worst thing in the world, but statements on websites should at least be verifiable.
[One thing that should be worth noting: unless all the vendors included in this study had all their liquids tested, just because a vendor's liquid wasn't found to have any diacetyl/diacetyl substitute properties, that only means that the specific liquid selected for testing did not. The one problem I see, with the coming results of this study, is that those vendors that are shown to have *not* tested positive for these chemicals may be incorrectly labeled as a "diacetyl-free vendor", when in reality it was just the the specific liquids tested that were shown to be free of said chemicals -- other liquids on their menu may still contain those properties.]
[One thing that should be worth noting: unless all the vendors included in this study had all their liquids tested, just because a vendor's liquid wasn't found to have any diacetyl/diacetyl substitute properties, that only means that the specific liquid selected for testing did not. The one problem I see, with the coming results of this study, is that those vendors that are shown to have *not* tested positive for these chemicals may be incorrectly labeled as a "diacetyl-free vendor", when in reality it was just the the specific liquids tested that were shown to be free of said chemicals -- other liquids on their menu may still contain those properties.]
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