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Answer:

Bloodshot eyes, pupils larger or smaller than usual.

Changes in appetite or sleep patterns.

Deterioration of physical appearance, personal grooming habits.

Runny nose or sniffling.

Sudden weight loss or weight gain.

Explanation:
1. Changes in appearance such as: bloodshot or glazed eyes, dilated or constricted pupils or abrupt weight change.

2. Altered behavior and / or habits.

3. Confusion, delusions and hallucinations.