Withdrawal symptoms are side effects of not having enough drug in your body. Other withdrawal symptoms may include increased appetite, insomnia, constipation, or diarrhea. Some drugs can cause violence, tremors, seizures, hallucinations and sweating. Withdrawal symptoms are what commonly prevent you from stopping drug use. Sometimes the symptoms can be too difficult to handle, so the user resorts to continued drug use. Addiction continues to occur even when people are aware of adverse health conditions. A person continues to take a drug even though he knows it is harming his body. For example, cocaine causes strokes because it narrows blood vessels in the brain. It can also cause heart attacks due to increased blood pressure and heart rate. Addiction can lead to social and recreational sacrifices. You may lose friends to drug addiction because you spend more time on drugs. An alcoholic may not be able to spend time with friends if they have a