Which of the following statements about genetic factors and addiction is correct?

Genetic factors play a significant role in addiction vulnerability, making this statement accurate. Research has shown that genetics can influence individual responses to substances, the likelihood of developing substance use disorders, and the severity of addiction. Specific genes can affect how a person's brain processes drugs and how they experience cravings and withdrawal symptoms. Studies involving twins, adopted individuals, and families have demonstrated that there is heritability associated with substance use disorders, indicating that genetics contribute to the risk of developing these conditions.

The other statements do not align with current scientific understanding. For example, claiming that genetic factors are insignificant overlooks substantial evidence indicating their importance in addiction. Suggesting that genetic factors only apply to certain substances fails to recognize that genetics can impact susceptibility across various types of substances, not just a select few. Lastly, stating that genetic factors are fully understood and predictable isn't accurate, as ongoing research continues to uncover new insights about the complexity of genetics and its interaction with environmental factors in addiction.