What symptom is commonly associated with narcotic influence?

The symptom most commonly associated with narcotic influence is fresh puncture marks. Narcotics, particularly opiates like heroin, are often administered intravenously, which can result in visible puncture wounds on the skin where needles have been injected. These marks serve as an indicator of potential drug use and are commonly observed in individuals under the influence of narcotics.

While increased energy, heightened reflexes, and extreme agitation may be associated with some other types of substances or conditions, they do not typically align with the effects of narcotics. Narcotics are known to produce a sedating effect, leading to decreased energy and cognitive functions, rather than increased alertness or agitation. This makes fresh puncture marks the defining symptom when considering the influence of narcotics specifically.