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The body often shows the first and most noticeable evidence of drug use. Different substances affect the body in different ways, but many physical signs of drug use are common across a range of drugs.

Track marks typically show up wherever veins are easiest to access. As those veins become damaged, people may move to new, less visible areas, which is part of why injection sites can shift over time.

Drug paraphernalia refers to any equipment, product, material, or accessory primarily intended or used to produce, conceal, consume, prepare, or otherwise handle illegal drugs. The term covers a wide range of items, from purpose-made products sold in stores to ordinary household objects repurposed for drug use.

Many drugs interfere with this system. Pupil dilation, known medically as mydriasis, often occurs when a substance stimulates the sympathetic nervous system, the “fight or flight” network that prepares the body for action.

While crack and powder cocaine are chemically similar, the practical differences shape how each affects users and how quickly addiction can take hold. The table below summarizes the main contrasts.

Cocaine is a stimulant that increases dopamine activity in the brain’s reward system by blocking the normal recycling of dopamine, the chemical tied to pleasure, reward, and motivation. Normally, dopamine is recycled back into the cells that release it.

Can you overdose on cocaine? Yes, and it is more common than many people assume. A cocaine overdose, sometimes called cocaine toxicity, occurs when the drug overwhelms the body’s ability to cope, sending the cardiovascular and nervous systems into crisis.

The body reacts strongly to cocaine, and many of the most reliable signs are physical. These appear during and shortly after use, when the stimulant is most active in the system.

The right dose is always determined by a prescriber, who starts low and adjusts gradually to find the lowest dose that controls symptoms.