Final answer:
The practice where a drug dealer never consumes the drugs that he sells is known as avoiding drug consumption.
Step-by-step explanation:
The practice mentioned in the statement where a drug dealer never consumes what he sells to others is avoiding drug consumption. The correct option from the provided choices would be C) Avoiding drug consumption.
This refers to a policy or personal rule that some drug dealers adopt, often to avoid addiction and to stay focused on the business aspect of their illegal activities. It is important to note that the selling and consumption of illegal drugs is harmful and against the law.