My guess is it is the throat hit.
At 50/50 pg/vg with 0 mg nicotine I get zero throat hit, it is nice and creamy.
At 50/50 pg/vg with 6 mg nicotine I get throat hit, and it is a little bit bothersome sometimes.
My guess is that at 24 mg nicotine, your throat hit is huge.
I'm planning to vape...