I've been hearing a lot about adding a hot flavor so the capsacian will give a throat hit.. I'm not really into menthol
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Koolada might still be worth checking out. It can give a kick or a bit of cooling sensation but isn't menthol or menthol flavored. I use it in some fruit flavors sometimes in small amounts when they need a little "oomph".
The other suggestions are really great though and I would pursue them first.