Even if your biology pulls you in one direction, you can alter your course by taking steps to safeguard yourself against addiction. Genetics account for an estimated 40 to 60 percent of the risk for addiction. That leaves another 40 to 60 percent for environmental and social factors that may be well within your control. If you decide to drink alcohol, do so moderately (no more than one drink a day for most women and no more than two drinks a day for most men, according to the Centers for Disease Control and Prevention). While most people may be able to drink moderately without difficulty. Those with a family history of addiction or other risk factors may find that their habit quickly escalates.