According to the US National Institute on Drug Abuse, the rate of relapse for drug and alcohol abuse as almost 66% within the first twelve months of sobriety. However the longer one stays clean and sober, the more likely one is to remain clean and sober. By the time someone has been sober for 3 years, the rate of relapse drops to 33%. By five years, rate of relapse falls to less than 15%. Source: (http://www.drugabuse.gov/publications/addiction-science/relapse/extended-abstinence-predictive-sust