When a prescription medication is stopped, withdrawal from the drug causes a return of the original symptom the medication was used for, often in a much worse degree.
Moderate to high doses of GHB are known to cause nausea to the point of having to vomit.
Marijuana users entering substance abuse treatment in the U.S. are most likely initiated into their use of marijuana at a very young age, with over 50% having done so by the age of 14 and almost 90% before the age of 18.