The best known addictions are those to alcohol, nicotine, drugs and medication. Besides substances, certain behaviours can be addictive as well, such as gambling, gaming and surfing the internet. In Belgium, approximately 50,000 people are addicted to illegal drugs and more than 700,000 to alcohol. Whether or not someone develops an addiction depends on several factors, like the type of substance involved, or one’s personality and environment. When someone in your family has an addiction or alcohol or substance abuse, you are more vulnerable to it yourself. Yet contextual factors play an important role too.