As we all know, addiction can happen even when a drug is not physically addictive. In the interest of creating a survey or questionnaire to gauge the level of abuse or addiction of a drug user, ol' I am trying to figure out what symptoms of mental/psychological addiction to include. He is thinking especially of those that would pertain to DXM, Ketamine, MDMA, mushrooms, LSD, and other psychedelics. Some examples include: - Spending a large amount of time thinking about the substance or planning one's next trip. - Using a substance again sooner than one expected in order to make up for a negative, disappointing or sub-par experience. - Depression or symptoms of craving if one does not use the substance when one was planning to (e.g. not rolling on MDMA on a weekend where one had planned to do so). What others can your pet lab rats add?