Pepper like burn

I'm currently using a Smok alien with the tfv8 big baby and the 0.16 octo coil (I think). Sometimes when taking a thoat hit after about 2 secs into the pull it's like someone's thrown pepper into my tank and my throat burns. Any ideas what's causing this. Oh and I'm vaping 80/20 diy Heisenblag at 1.5 mg

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