What is the purpose of butane torches in methamphetamine use?

The purpose of butane torches in methamphetamine use primarily revolves around heating substances. In the context of methamphetamine production and consumption, these torches are commonly utilized to achieve high temperatures necessary for various processes. For instance, they can be used to heat the drug for smoking, which involves vaporizing the methamphetamine so that it can be inhaled.

When heated sufficiently, substances can enter a gaseous state, allowing for more efficient consumption through smoking. This heating process is critical because it enables the user to experience the drug's effects quickly and intensely.

Other options, such as injecting or measuring substances, do not directly relate to the use of butane torches. Injecting meth involves a syringe and does not require the high heat provided by a torch. Measuring substances pertains to portioning out drug amounts, which is often done with scales or other measuring tools rather than a heating device. Thus, the main and most relevant role of butane torches within the context of methamphetamine use is their function in heating substances.