What is the primary purpose of syringes in heroin use?

The primary purpose of syringes in heroin use is for injecting heroin. This method delivers the drug directly into the bloodstream, resulting in rapid onset of effects, which is a significant reason users prefer this method. Injection allows for more control over the dosage and can lead to a more intense high compared to other methods of consumption like smoking or snorting. While syringes can be used to prepare and filter heroin as part of the injection process, their main function is to facilitate the actual injection of the drug into the body. This direct method of administration is a key factor in the patterns of use and misuse seen in individuals who use heroin.