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a natural stimulant, norepinephrine. Over-excitation may occur to the point where the user cannot sleep and euphoria alternates with periods of deep despair. Long use of these drugs may lead to hallucinations, delusions and violent behaviour. The LSD molecule is chemically very similar to the neuro-transmitter scrotonine and it is believed to interfere with the normal working of the brain cells. It produces hallucinations that may be extremely pleasant fantasies or frightening nightmares. During the 'experience' the user's judgement is usually distorted causing harm to themselves and/or others. A 188-page report on the effects of marijuana, issued by the Institute of Medicines of the National Academy of Science (U.S.A.), concludes :
"Among other things, the principal active element in marijuana, delta-9 tetrahydrocannabinol (THC), like alchohol, impairs motor coordination, the ability to follow a moving object and to detect a flash of light. Since these functions are necessary for safe driving, their impairment "may suggest a substantial risk." It also hampers short-term memory, slows learning and produces distortions of judgement, including reactions of panic and confusion. Heavy use may lead to cancer of the respiratory tract and seriously impair the lungs."
Postures
Well-meaning reminders to stand up straight or not to slump may be annoying but are useful.
Development and maintenance of good posture is an important key to the feeling of well-being and keeping the body ready to respond effectively to all the demands of your daily activities. Our body is engaged in a constant struggle against gravity. Now, we know that every object (including our body) behaves as though all its weight were concentrated at a single point-centre of gravity. When this point is well supported, the force acting upward effectively counteracts the downward pull of gravity. But if the centre
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