Vehicle Excise Duty (VED or Road Tax) as it applies to motorhomes. It came to our attention that there was an anomally in the classification for road tax purposes of some new motorhomes since the introduction of Graduated Vehicle Excise Duty in 2001 (where the duty paid is related to the amount of CO2 produced).t came to our attention that there was an anomally in the classification for road tax purposes of some new motorhomes since the introduction of Graduated Vehicle Excise Duty in 2001 (where the duty paid is related to the amount of CO2 produced).
substance-related disorder. Any disorder related to drug abuse or the effects of medication. Substances include alcohol, amphetamines, anxiolytics, cannabis, cocaine, hallucinogens, hypnotics, inhalants, methamphetamine, nicotine, opioids, phencyclidine (PCP), and sedatives.ubstance-related disorder. Any disorder related to drug abuse or the effects of medication. Substances include alcohol, amphetamines, anxiolytics, cannabis, cocaine, hallucinogens, hypnotics, inhalants, methamphetamine, nicotine, opioids, phencyclidine (PCP), and sedatives.
However, they are distinct disorders that must be treated as such in order to get a good outcome for the patient.â. Drug Abuse and Mental Illness: Likely Conditions. Certain mental conditions are frequently associated with alcohol and drug dependency. They include: 1  Depression.2  In some cases, individuals may start to abuse a substance to mask the symptoms of depression. There is also evidence that addiction and mental disorders are associated with the dysfunction of a group of brain chemicals called monoamine oxidases. 2  Shared environment. 3  Studies surrounding twins also showed that environment plays a major role in having both a substance abuse problem and another mental disorder.