Whether it does or not depends on an individual child's reasons for experimenting, on his or her personal values and resources, and on how parents respond. Overall, use still tends to be casual, mainly in social situations, and a user's everyday functioning is not necessarily impaired. About 90 percent of the substance-using population falls into one of these two categories. Excessive use Preoccupation with the quality and effects of drugs is noticeable, as is a rising degree of impairment. Responsibilities are neglected.
Relationships can become strained and go downhill rapidly.
Family members may find themselves making excuses for the abuser, or taking over tasks that are really his or hers. Many heavy drinkers who don't consider themselves alcoholics are actually at this stage. A user's functionality is clearly affected, and the ability to stay in school or hold a job is shaky, at best. Few friends remain who aren't heavy users themselves. Still, just because the equation is complicated doesn't mean it's unsolvable.