Drug addiction is characterized by a dependence on drugs that can completely disrupt a person’s life. A person’s brain and body can become used to a substance and they will eventually need more of the same to produce the same effect they used to enjoy initially. This leads to problems like overdose, death, paranoia, impulsiveness, and more.
A psychologist is a mental health professional who helps n treating drug addiction. They hold either a Ph. D or master's in psychology and focus on using psychotherapeutic techniques that help a person identify the triggers that lead them to consume substances and help them develop coping skills against substance abuse.