It is not uncommon for marijuana substance abuse treatment admissions to also report the use of alcohol and other drugs.
When an individual stops consuming alcohol, alcohol level in their body can actually continue to increase. No amount of coffee, cold baths, showers, or trying to walk it off will stop this process.
The same exact dose of Methadone could be ineffective for one person, but could also cause a deadly overdose for someone else who isn't tolerant to that dose.
Methamphetamine may dry mucosa which may then lead to more chafing and abrasions in the genital area, which could make methamphetamine users more susceptible to HIV during sexual activity.