Any kind of drug and alcohol abuse such as this causes dependence, which is reliance to one's substance of choice due to the way drugs or alcohol have an effect on the body and mind. For example, a person may start taking drugs due to something going on in their life that they are looking to avoid mentally or physically. They will use drugs and alcohol or drink alcohol so that they do in fact produce a temporary escape from the situation which are bothering them. Sadly, this escape is in reality only temporary. Soon after the drug's effects have worn off, the difficulty is often actually significantly worse and the individual will experience the desire to consume more drugs in an effort to subdue the issue evenmore. With many substances of abuse, the dependence is both mental and physical in nature and people will also encounter extreme withdrawal symptoms when they suddenly stop taking their drug of choice. This is what can make it so tough to quit and why people will require suitable rehab in a drug rehabilitation facility to make sure it is possible to do so.