Cause of Drug Addiction
The cause of drug addiction varies from addict to addict. Experimentation  and curiosity are the first factors that draw many people to try drugs. They  want to feel that "high," the sense of euphoria that comes with drug use.  Others turn to drug use to cope with problems in their real lives. Whether it  is past abuse (physical or sexual), school problems, work problems, or  relationship issues, drug use can help a person temporarily escape the  realities of his or her life. 
Often it is questioned what makes one person abuse drugs to  the point of losing their home, their family, and their job while another does  not? There is no one simple answer to this question. The cause of drug  addiction has many factors. A powerful force in addiction is the inability to  self- soothe or get relief from untreated mental or physical pain. Without the  self-resilience people often turn to drugs to deal with stress, loneliness, or  depression. Unfortunately, due to the changes drugs make to the brain, it may  only take one time using drugs before an individual is on the road to  addiction. Some other risk factors include:
  - Family history of addiction. While the interplay  between genetics and environment is not entirely clear, if you have a family  history of addiction, you are at higher risk for abusing drugs.
 
  - History of mental illness. Drug abuse can worsen  mental illness or even create new symptoms. 
 
  - Peer pressure. If people around you are doing  drugs, it can be difficult to resist the pressure to try them, especially if  you are a teenager. 
 
  - Untreated physical pain. Without medical  supervision, pain medications or illegal drugs like heroin can rapidly become  addictive. 
 
One main cause of drug addiction is the inability to cope  with crisis. Loss, disappointment, feelings of rejection, loneliness, and  failure frequently lead to physical and emotional symptoms. As symptoms of  headaches, tension, sleeplessness, and depression increase, medications become  a solution for many. Some will get prescriptions from a physician or try to  medicate themselves using other substances.
When it comes to the cause of drug addiction to prescription  drugs, often the individual begins with a legitimate prescription for pain  medication. They become addicted because they take more than the recommended  dosage, take it more frequently than recommended, and continue using the drug  after their initial medical condition clears up. For example, pain medication  is intended to bring relief to an injured or stressed area of our body. The  beginning stages of drug addiction cause us to crave more and ultimately to use  more. The unintended consequences of that is our need to take more and more of  the drug to get the same result. 
Think of drug addiction as a progression. A person uses  drugs and at some point the pathways inside the brain are altered. Physical  changes in the nerve cells are brought on by the drug. These cells (neurons)  communicate with each other releasing neurotransmitters into the gaps or  synapses between the nerve cells. This makes some drugs more addictive than  others depending on their affects in the brain.
Another cause of drug addiction is when a person is around  drugs and is exposed to addicts on a regular basis. If a family member or close  friend uses or is addicted to drugs, it becomes acceptable for other members to  engage in similar behavior. In other words, it becomes a tolerated activity. 
One leading cause of drug addiction is peer pressure.  Contrary to popular belief, peer pressure can happen at any age. Adults fall  prey to peer pressure to fit into new social classes, new workplaces, and new  neighborhoods. Teenagers fight peer pressure on everything from looks to  alcohol, sex and drugs. 
Yet another cause of drug addiction may be the increased  accessibility of drugs and the lower prices for many common drugs. Drugs can be  found practically anywhere if a person simply asks. Street corners and  alleyways are no longer the only place to find drugs. Schools, workplaces, and  even the family next door might be new places to find drugs. With more drugs  being produced, the price has also been driven down. 
For some, the cause of drug addiction can be attributed to  the need to mask other mental problems. For example, depressed people  frequently use drugs to escape their sad feelings. Schizophrenics find that  some street drugs can control their hallucinations. Denial and hiding the  problem just leads to more problems in the long run.