Development. Addiction risk is influenced in part by genes, the environment and key developmental periods during a person’s lifetime. Genetics. Although addiction to drugs can occur at any time, it is more likely for those who use drugs regularly and for longer periods of time. Teenagers are particularly vulnerable in this regard. Because their brains still are maturing, drug experimentation and other risky behavior may be more common in adolescents. These behaviors include poor judgement, decision-making and lack of self control.
                
 
You may develop tolerance or even physical dependence if you use opioids to treat pain for a long time. However, this does not mean that you are addicted. Only a small number of patients with addiction who receive adequate medical care are able to use drugs.
The Impact of Positive Events on Your Brain: Your brain is designed to encourage you to repeat positive experiences. You feel inspired to try new things.
 
Effect on Your Brain: Your brain is programmed to encourage you to repeat positive experiences. You're inspired to perform them repeatedly as a result. 
                                            
                                             
Also, physical dependency and tolerance can be different than addiction. It is possible to feel withdrawal symptoms when you stop using a substance after becoming a dependent. Tolerance occurs when a drug is less effective than it used to be over time.
To put it another way, if opioids are used frequently to treat pain, your tolerance could increase and you could even become physically dependent. This does not mean that you need to be dependent on them. Most people won't become dependent on opioids even if they are prescribed properly and administered under the guidance of a physician.
Impact on your state of mind You will be encouraged to continue these actions. 
  
Biology. About half of the risk for addiction can be attributed to genes. Other mental disorders, gender, ethnicity and race may all play a role in drug abuse and addiction risk.
Environment. The environment a person lives in includes many factors, including family, friends and economic status. It also affects their quality of living. Factors like peer pressure, abuse and neglect, early exposure to drugs and stress, parental guidance, and other factors can all have an impact on the likelihood of a person developing a dependency.
                                             
Addictions to drugs are treatable and can be effectively treated.
You can prevent both drug addiction and use by being careful. The majority of young people are aided by their parents, teachers and medical professionals to help them avoid drug abuse and addiction. 
Tolerance is a result of the brain's gradual adaption to the extra dopamine. This decreases the effect on the body relative to how it felt when they first began using the medication. They could also take more of the medication to achieve the same dopamine boost.
A combination of several factors can affect the risk that someone develops a drug addiction. An individual's risk of developing an addiction depends on a combination of genetic, environmental, or developmental factors. As a result, addiction is more likely to occur.
Drug addiction can easily be controlled and treated.