i cough, and i use my volcano. its just that no matter what your taking into your body a substance which has been heated to somewhere around 300 degrees. so like what affects me, its never the smoke, its the heat, my throat burns and my bronchial tubes can feel it, my lungs cough. especially after a long session. dont forget that your vaporizer is using heated air, which also dries out all your passage ways, try taking hot water hits from a bong, or have a cup of steaming water and inhale the steam when you feel the coughs coming.