Following the high of extreme happiness and a sense of unending energy is a cocaine crash including depression, dullness, intense anger and paranoia. Injecting cocaine with contaminated equipment can cause AIDS, hepatitis and other diseases. Tolerance develops rapidly, and psychological and physical dependency can occur. Crack or rock is extremely addictive and produces the most intense cocaine high. The use of cocaine can cause kidney damage, heart attacks, seizures and strokes due to high blood pressure.
Death can occur by cardiac arrest or respiratory failure.
Stimulants Amphetamines and other stimulants include ecstasy and ice. The physical effects produced are elevated heart and respiratory rates, increased blood pressure, insomnia and loss of appetite. Sweating, headaches, blurred vision, dizziness and anxiety may also result from use. High dosage can cause rapid or irregular heartbeat, tremors, loss of motor skills and even physical collapse. Long-term use of higher doses can produce amphetamine psychosis which includes hallucinations, delusions and paranoia.