An individual using the drug experiences a strong compulsion to take more of the drug each time it is used. The speed and probability of addiction differs for each individual, but for those with a personal or family history of drug addiction or alcoholism, addiction is significantly increased. Cocaine causes psychological and physiological changes. The psychological symptoms are depression, intense anxiety, confusion, hallucinations, irritability, poor concentration, compulsive lying, withdrawal from normal activities, paranoia, and mental illness indistinguishable from schizophrenia. The physiological symptoms are increased blood pressure, tachycardia, myocardial infarction, myocardial rupture, increased body temperature, insomnia, fatigue, cold sweats, pale skin color, tremors, weight loss, decreased libido, vomiting, dilated pupils, and seizures.
Fetal addiction can occur if the drug is used during pregnancy.
Marijuana is a complex drug with over 400 chemical ingredients. Burning marijuana results in as many as 2,000 secondary chemicals. Marijuana affects cell function, cell division, and cell immunity. The CNS effects of marijuana result from the enlargement of the nerve cell synaptic cleft. Marijuana negatively affects comprehension, memory, sleep, mood, coordination, and vision.