Wild look
An identifying characteristic of someone who is using drugs excessively can sometimes be that no matter how attractive they are they have a wild look. A look that threatens any notion of the personal safety of those around, even though it may not be intentional. That look appears to see through people and lacks intimacy. It creates a feeling that the afflicted person is possibly out to take whatever they can and we need to protect ourselves and our possessions. Yet the person in question thinks that no one can tell that they have be using drugs. Therefore, it is important to challenge the behaviour safely and tell them what we see, instead of pretending it is not obvious.