Related Clues:

• Fiend
• Nut
• Junkie
• User
• Devotee
• Hound
• One with a habit
• Enthusiast
• Compulsive type
• Aficionado
• Rehab target
• Bricklayer's tool
• Detox center candidate
• Habitual user
• Fiend … or a hint to this puzzle's theme