Genetic Causes of Drug Addiction
Drug addiction tends to run in families, indicating genetics may have a role in causing drug addiction. In fact, in studies of twins it appears half of someone's risk of becoming addicted to drugs is genetic.2 Genetic causes of drug addiction appear to involve multiple gene sequences and science has not yet been able to pinpoint all the genes involved. However, it is known some genes, like those involved in brain receptors of nicotine, contribute to the cause of drug addiction.