Solvent use frequently occurs while the central nervous system is still in the process of developing. There is evidence to suggest THC accumulates in body stores and is related to acute and chronic psychiatric reactions. Physical effects Increased risk of respiratory disorders and lung cancer associated with smoking. Impaired attention and concentration Impaired short term memory and learning ability Stimulants Stimulants, including amphetamines, ecstasy and cocaine have surprisingly received little research attention. The most commonly used amphetamines in Australia, in decreasing order of potency, are dexedrine, methedrine and benzedrine.
Ecstasy is a derivative of amphetamine.
Less is known about the long term effects. Physical effects Some irregularities of cerebral arteries have been found in long term users Cognitive and psychological effects Long term use has been associated with poor abstracting ability and perceptuo-motor slowing Opiates Opiates include heroin and heroin derivatives. The research of the long term effects of opiates is limited. Some researchers have found long term opiate users to have impaired visuospatial and visuomotor functions. Other research has related long term use of opiates to high level cognitive impairment affecting the brain's ability to integrate and coordinate a range of cognitive skills.