What is MSM commonly used for in the context of drugs?

The correct answer is that MSM, or methylsulfonylmethane, is commonly used in the context of drugs for cutting meth. Cutting agents are substances mixed with drugs to increase profits, dilute the product, or alter its effects. MSM is an organic sulfur compound that can be added to methamphetamine to increase its volume without significantly affecting its appearance or certain properties, making it a popular choice among those who manufacture or distribute meth. Understanding this context is crucial for recognizing the practices within drug trafficking and manufacturing, particularly in how drug dealers manipulate the purity and profitability of illicit substances.

The other options, while related to drug use, do not accurately reflect the primary association of MSM in this context. For instance, while some substances are injected, stored, or smoked, these methods do not connect directly to MSM's common application.