This is a group of drugs that increases alertness and physical activity. Amphetamines increase heart and breathing rates and blood pressure, dilate pupils and decrease appetite. A user can experience insomnia, loss of appetite, sweating, dry mouth, blurred vision, and dizziness. In addition to the physical effects, users feel restless, anxious and moody, become excitable and have a false sense of power and security. Amphetamine overdose can also cause cardiac arrhythmias, headaches, convulsions, hypertension, rapid heart rate, coma and death.
Amphetamines are psychologically and physically addictive.
Nicotine Nicotine is the active chemical found in tobacco. Its chief hazards are cancer of the lungs, larynx and mouth. Nicotine is a highly addictive stimulant and contributes to approximately 340,000 Americans' deaths annually. Caffeine may increase rates of miscarriage and low birth weight. Caffeine withdrawal symptoms include fatigue, headache, nausea and irritability.