There are many factors that influence whether or not someone will become addicted to drugs. There are many factors that can influence addiction, including genetic, environmental and developmental. Predispositional factors that increase the risk of a person becoming addicted to a substance are more common.
                
 
Is it possible not to get addicted to drugs?
Drug addiction treatment, like other chronic conditions such as heart disease, diabetes, asthma, or heart disease, rarely results in full recovery. The good news is that addiction can be treated. The chances of relapse are high for people who are trying to recover an addiction. A majority of addicts can recover by using a combination of medicine and behavioural treatment. You can maintain abstinence with treatment techniques that are specific to each person's drug abuse history as well any medical, mental, or other health concerns.
 
Changes in the brain that result from chronic drug abuse compromise a person's self-control and impair their capacity to withstand acute drug cravings. This is why drug addiction is also a condition characterised by relapse.
Relapse is the return to drug usage following an abstinence effort. Relapse signifies the need for more or alternative treatment. 
                                            
                                             
The Effect on Mental Health: Your brain is programmed so that you are able to experience similar emotions. These are the behaviors that will keep you motivated to perform them again and again.
Drugs that can lead you to addiction target your brain's reward system. Dopamine, a neurotransmitter is released in high quantities into your brain. This causes a state of pure joy. You continue taking the drug to recreate the high.
Your brain will soon adjust to the high levels of dopamine. For the same effect you will likely need to take more dopamine. Other things that used bring joy to you, such food and time spent with your family, may not be as effective. 
  
Keep in mind that people can develop a tolerance to pain medication. This means that they may need to increase the dosage of the medicine to get the same level of relief. This is normal and does not indicate an addiction problem. You might have to take more if you have an addiction. However, this does not mean you are suffering from pain. If this side effect is severe, consult your doctor.
                                             
Many drugs give pleasure and flood the brain's reward circuit with dopamine. A healthy reward system will encourage people to continue doing the necessary things, such eating and spending quality time with loved ones. This is essential for survival. Dopamine spikes in the reward circuit encourage people to indulge in dangerous, but fun, behaviours such as drug use.
The brain adapts to drug use by decreasing its ability to respond to reward circuit stimuli. This reduces the person’s high compared to when they first took the drug. This is known as tolerance. For the same effect, they might need to take more of the drug. People with brain changes often find it harder to enjoy once-loved activities, such as eating and sex. 
If a person continues to use drugs, the brain will adapt by decreasing the ability of reward circuit cells to respond to it. As long as the individual continues to use drugs, this will continue. Tolerance, also known as the "lower" effect, is a phenomenon that reduces the amount of high an individual gets compared to when they first took the drug. You can achieve the same high by taking more of the drug. These brain changes can cause an individual to lose pleasure in other activities they once enjoyed, such as eating or sexual activity.