One psychological effect of doing drugs is having a constant need or want for a certain drugs. Every person has a reason for doing drugs, but one of the biggest reasons is to cope with pain or other emotions. A person will start using a drug to get rid of this pain or emotion that they are having trouble with. They keep doing the drug as soon as that pain or emotion comes back and eventually they will start to build up an addiction to this drug.
Some other psychological effects of drugs include: (coming soon)