What is gel capsules primarily associated with in terms of heroin use?

Gel capsules are primarily associated with packaging heroin because they serve as a discreet and practical method for containing the drug. These capsules can easily mask the presence of heroin and make it more portable for users and dealers. They also facilitate more precise dosing when preparing to use the substance, which can reduce the risk of overdose compared to less controlled methods of ingestion.

The other choices suggest different functionalities that are not directly linked to the primary use of gel capsules in the context of heroin. While they might involve drug-related activities, gel capsules specifically play a key role in the packaging and transport of heroin, highlighting their significance in the drug culture surrounding its use.