not for me. at firts i was usin gunderground pro fina. i didn`t get the cough ,or anything. last week i switch to fina by international pharmacy. i felt the coolness,and tickle in the back of my mouth. i felt the cough coming ,but i fought it off. i also felt a little hot. thru out the day. now i know the shit is real,and it`s working i can`t wait to take my next shot.