People who use cocaine regularly become very dependent on it and may need larger doses with more frequency to get the same effect. Cocaine can cause anxiety, restlessness, sleep impairment and lack of appetite, which can lead to severe weight loss. The repeated sniffing of cocaine can damage the tissues in the nose and cause sinus ulcers. Chronic cocaine use can lead to feelings of paranoia and anxiety, severe breathing problems and heart failure. Chronic speed users may experience intense emotional disturbances, like anxiety, fear, and even mental illness.
Speed lowers the body's natural defenses against disease.
Chronic speed users often don't eat enough, which can cause malnutrition and severe weight loss. Chronic speed use can cause high blood pressure and heart failure. Some people believe marijuana has medicinal properties that help people with serious diseases. Marijuana can also be addictive, however. Chronic marijuana use can cause confusion, fatigue and forgetfulness.