For instance, one researcher has found a potential hereditary component to nicotine addiction. The correlation between genetics has been linked to the inability to quit smoking cigarettes. The clinical trials found that certain smokers experienced more pleasure from the inhalation of nicotine than other individuals. The finding was traced to the brain's genetic differences along with the way the reward pathway is mapped to release dopamine.

Current trials have theorized that the DNA repair capacity may be regulated by the process known as genetic control. The theory explains how certain people are more susceptible. The process works when the genetic control helps maintain the integrity of genes. The genes are perpetually repaired of the damage that occurs to DNA (exposure to harsh chemicals (nicotine) ultra-violet rays). When an error transpires during the repair system, DNA damage may trigger unstable genes and a heightened risk of cancer.

In conclusion, researchers have found that certain patients have stronger DNA repair functions than other people. With the new breakthrough in medical science, physicians may be able to diagnose patients at an earlier age who are at higher risk of acquiring cancer. As a result, customized medical therapies could be prescribed to prevent individuals at the highest risk of cancer from exposure.