It is known to be a very addictive substance. Smokers can become physically and psychologically dependent. The long term health risks of smoking cigarettes include emphysema, heart disease, stroke, and cancer of the mouth, larynx, pharynx, esophagus, lungs, pancreas, cervix, uterus, and bladder. The short-term effects of using marijuana include sleepiness, memory and concentration problems, impaired motor coordination, increased heart rate, dry mouth and throat, and decreased social inhibitions. The long term effects of using marijuana include impaired lung functioning, sexual problems, breast tissue development in men, and possible immune system damage.
Stimulants increase the activity of the central nervous system.
Examples include amphetamines, methamphetamines, cocaine, and crack which cause short term elevations in mood, self-confidence, energy, heart rate and blood pressure. Potential difficulties associated with the more powerful stimulants such as these include possible physical addiction, psychoses, severe depressions, and anxiety syndromes such as panic attacks and obsessions. Additional health risks include seizures and cardiac arrest. V. Hallucinogens are substances that distort perception of reality. Under the influence of these drugs, the senses of direction, distance, and time become disoriented.