Yes it affects brain Once inhaled, THC rapidly passes from the lungs to bloodstream through which it gets dispersed throughout the body. When it reaches brain, it gets attached to receptors named cannaboid on nerve endings and stimulates the activity of these cells. Areas of brain like hypothalamus, cerebellum that controls the activities like memory, coordinated body movements, pleasure, concentration, thoughts. The initial short term effects that found after inhaling Marijuana are distorted perception, loss of memory, lack of reasoning. Besides short term effects, there are long terms effects as with any prolong drug abuse. If the subject is chronically exposed to THC, then its withdrawal stimulates stress response system. It disrupts the function of dopamine present in the nerve cells which is responsible for regulation of motivation.
reference: buzzle.com
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