Increased tolerance--drinking larger amounts of alcohol, using increasing  dosages of drugs.

Drinking or using drugs at inappropriate times, resulting in embarrassment to the individual or others.

Attempts to decrease use are unsuccessful.

Defensiveness or angry reaction when asked about drinking/drug usage.

Increased amount of time spent drinking, increased attendance at social  situations that center around drinking.

Deterioration in appearance.

Giving up once-enjoyed hobbies in favor of drinking/using drugs.

In adolescents: mood swings, sleeping at inappropriate times, increasing  problems with school, parents and/or legal problems.