More than 6% of 8th graders and 21% of 12th graders reported using marijuana within the past month, the survey found, and about 1% and 6% of 8th and 12th graders, respectively, said they used the drug daily.
“The mechanism underlying the stimulation of reproductive function by marijuana in pubertal boys needs to be examined in detail. Furthermore, the suppressive effect of cortisol on growth directly through inhibition of growth at the cellular level by depletion of nutrients or indirectly through inhibition of growth hormone secretion needs to be further studied,” Rizvi said via email to MedPage Today.
“In addition, it is to be ascertained whether cortisol itself or some other factor like nutritional status is attributable to decline in growth rate in pubertal marijuana addicted boys. We are examining these aspects currently,” Rizvi said.
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— Study adds to evidence for developmental abnormalities with teen marijuana use
Study participants who were described as “marijuana addicts” during boyhood were on average 4.6 inches shorter and 4 kg lighter at age 20 than nonsmokers, reported lead investigator Syed Shakeel Raza Rizvi, PhD, and colleagues at the PMAS-Arid Agriculture University Rawalpindi, in a presentation at the European Congress of Endocrinology in Dublin.
Boys who smoked marijuana heavily were significantly smaller than their peers by the end of their adolescent growth phase, according to a study conducted in Pakistan.
by Jeff Minerd, Contributing Writer, MedPage Today May 20, 2015
In the U.S., marijuana is the most popular drug among young people, with 11.7% of 8 th graders and 35.1% of 12 th graders reporting having used it within the past year, according to a 2014 survey from the National Institute on Drug Abuse (NIDA).
Plasma concentrations of luteinizing hormone, testosterone, and cortisol were significantly higher in the marijuana addicted boys, but levels of growth hormone were significantly lower.
According to the latest report from the European Monitoring Centre for Drugs and Drug Addiction (EMCDDA) the highest prevalence of marijuana use is among male 15 to 24-year-olds.
The scientists, led by Dr Syed Rizvi from the Pir Mehr Ali Shah Agriculture University in Rawalpindi, wrote in a study: “Marijuana use may provoke stress responses resulting in stimulation of pubertal development and suppression of growth rate.”
It is thought that 80.5 million Europeans have had cannabis at least once in their life.
Boys who smoke cannabis before reaching puberty may grow less than those who don’t, according to research.
The researchers found puberty-related hormones such as testosterone were higher in the drug users and growth hormones were reduced.
Scientists from Pakistan studied the hormones in the blood of 437 boys, including 217 who regularly smoked cannabis before puberty.
By the age of 20, non-cannabis smokers were on average 4kg (8.8lbs) heavier and 4.6 inches (11.6cm) taller than smokers.
Scientists also found that levels of the stress hormone cortisol were significantly higher in saliva samples from boys taking cannabis.
Dr Rizvi said: “Early puberty is associated with younger age onset of drinking and smoking, and early matures have higher levels of substance abuse because they enter the risk period at an early level of emotional maturity.”