Hey guys, I have been getting a pepper or hotness from my vanilla flavors. After some research I found some interesting facts about vanilla. I'm not a chemist so I won't try to explain it I will just copy and paste some text from another source.
So let’s talk some food science! That painful burning associated with the consumption of a chili pepper comes from compounds known as capsaicinoids, the most well-known of which is capsaicin. (FUN FACT: Capsaicinoids are derived from the compound vanillin, which gives vanilla its delicious taste and smell.) and this. Capsaicin (trans-8-methyl-N-vanillyl-6-nonenamide) is a naturally occurring alkaloid derived from plants of the genus Capsicum, better known as chili pepper fruit. It is a member of the vanilloid family of compounds (e.g., vanillin from vanilla)
So I'm assuming from this that since there is capsaicinoids in vanilla that is where the pepper/hotness comes from.
Just sharing for those who are interested
This could be somewhat legit, though as a pepper taster in TFA VBIC, it's definitely more of a black pepper spice note. Not so much the burning sort of feeling that eating a chilli will do to the nerves in your mouth/tongue (TRPV1 specifically is the receptor in the nerve - to which capsaicin binds and consequently triggers nociceptive pain signals... ouch).
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