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.
Schizophrenia Biology Â· Schizophrenia and Substance Abuse. Psychiatric problems often occur comorbidly, or in association with one another. A common comorbid disorder in association with mental illness is drug addiction. It has been hypothesized that this may be because people who suffer from mental illness are more susceptible to drug use and addiction because of their compromised mental state and/or the difficulty they experience in dealing with their illness.