Following are common and best known symptoms of a drug use:
- Rejecting job performance and loss of interest in their career
- Untamed and unpredictable behavior such as tardiness or being out of contact
- Instant weight loss or gain
- Large or pin-prick sized pupils
- Pale and thin appearance
- Marks on arms such as needle marks, blisters on lips, blisters on thumbs and fingers
- Loss of money and deteriorating financial situation, never having money, borrowing money
- Missing money or possessions in presence
- Uncaring attitude towards personal possessions
- Glass pipes, burnt/broken light bulbs, rolling papers, tinfoil, hypodermic needles, melted lighters, plastic 'bankies' in their possession
- Isolation and avoidance of family and friends
- Degeneration of relationships
- Secretive behaviour
- Violent outbursts and rage
- Dramatic changes in moods and personality
- Lack of interest in things which used to please them