Vata is the dosha of air and thus is responsible for movement. It is dry, volatile, cold, irregular and flighty. A person who has a predominance of vata will usually be thin, with dry skin, frizzy hair, hard but brittle nails, uneven teeth and the eyes may have a greyish tinge. Vata people have great ideas, good short-term memory and are often impulsive, but lack the stamina and discipline to go through with things. A disturbance in vata is usually brought about by unstable circumstances, windy conditions and upheaval or change in general. It is exacerbated by raw foods, marijuana and psychedelic drugs, and a lack of routine.