What effect does carbon have on people's health?

Pure carbon has extremely low toxicity to human body, and can be treated in the form of graphite or activated carbon, or even safely ingested. For example, carbon can resist dissolution or chemical attack, even when faced with acidic substances in the digestive tract. So once it enters human tissue, it may remain indefinitely. Carbon black may be one of the earliest pigments used for tattoos. For example, Oz the Iceman was found to have a carbon black tattoo, which existed from his life until 5200 years after his death. However, it is dangerous to inhale a large amount of coal (or carbon black) dust or smoke, which will stimulate lung tissue and cause congestive lung disease and coal workers' pneumoconiosis. Similarly, if you eat or inhale diamond powder by mistake, it will be dangerous.