The use of drugs can impair memory. Difficulties can arise in processing information for storage, storage itself, and information retrieval.
Different drugs can cause different memory problems. Some substances can directly cause a (temporary) reduced functioning of the memory. For example alcohol, benzodiazepines, cannabis, MDMA and ketamine. And with some drugs it only comes into play after heavy use. For example with alcohol. This often involves a permanently impaired functioning of the memory. Sometimes there is an improvement after stopping use, for example with cannabis.