chronic coughing(no pun intended)can lead to a rupture in the veins running through the brain. This isnt a common thing, but it does happen.
One story comes of of Holland where a man was smoking some hash and coughed so hard that he ruptured/hemorage a vein causing death. Any further information you need may be accessed via google.
I would do smaller hits if i had the cough episodes that you speak of having.
Take it easy.
dai*ma :thumbsup: