My Comment: I don’t know what disturbs me more, the fact that teens are smoking this or the fact that they had to do a study on it. It’s been proven in the past that using this drug destroys brain cells, yet they have encouraged this by legalizing it. Now we’re paying the price. And it’s a high price to pay, our children’s lives should carry more weight with us, instead of setting examples of not partaking in drug use, we encourage it. More evidence of the breakdown of the family and the fall into an immoral society.
Teenagers who regularly smoke cannabis suffer long lasting brain damage and are in much greater danger of developing schizophrenia.
American researchers say the drug is particularly dangerous for a group of people who have agenetic susceptibility to the mental health disorder – and it could be the trigger for it.
Asaf Keller, of the University of Maryland School of Medicine, said the results highlight the dangers of teenagers smoking cannabis during their formative years.
The study found that even short-term exposure to cannabis impaired brain activity, with the damage continuing into adulthood
The study, published in the journal Neuropsychopharmacology, exposed young mice to the active ingredient in marijuana for 20 days.
It found that their brain activity was impaired, with the damage continuing into adulthood.
The past 20 years has seen major controversy about the long-term effects of marijuana, with experts divided over its long-term effects on teenagers.
Previous research has shown that children who started using marijuana before the age of 16 are at greater risk of permanent brain damage, and have a significantly higher incidence of psychiatric disorders.
‘Adolescence is the critical period during which marijuana use can be damaging,’ said the study’s lead author, Sylvina Mullins Raver, a PhD candidate at the University of Maryland School of Medicine.
‘We wanted to identify the biological underpinnings and determine whether there is a real, permanent health risk to marijuana use.’
The scientists began by examining cortical oscillations in mice. Cortical oscillations are patterns of the activity of neurons in the brain and are believed to underlie the brain’s various functions.
These oscillations are very abnormal in schizophrenia and in other psychiatric disorders.
VIDEO: Scientists explain how cannabis damages the teenage brain
The scientists exposed young mice to very low doses of the active ingredient in marijuana for 20 days, and then allowed them to return to their siblings and develop normally.
‘In the adult mice exposed to marijuana ingredients in adolescence, we found that cortical oscillations were grossly altered, and they exhibited impaired cognitive abilities,’ said Raver.
‘We also found impaired cognitive behavioural performance in those mice. The striking finding is that, even though the mice were exposed to very low drug doses, and only for a brief period during adolescence, their brain abnormalities persisted into adulthood.’
The scientists repeated the experiment, this time giving marijuana to adult mice that had never been exposed to the drug before.
According to the research team, there is a group of people who have a genetic susceptibility to developing schizophrenia. Adding weed to the mix during adolescence could be the trigger that causes it to develop, permanently impairing brain function and cognition
Their cortical oscillations and ability to perform cognitive tasks remained normal, indicating that it was only drug exposure during the critical teenage years that impaired brain activity.
‘We found that the frontal cortex is much more affected by the drugs during adolescence,’ said Keller.
‘This is the area of the brain controls executive functions such as planning and impulse control. It is also the area most affected in schizophrenia.’
Keller now wants to know whether the effects can be reversed. ‘We are hoping we will learn more about schizophrenia and other psychiatric disorders, which are complicated conditions,’ he said.
‘These cognitive symptoms are not affected by medication, but they might be affected by controlling these cortical oscillations.’
CANNABIS DESTROYS YOUR GET-UP-AND-GO
A separate study by Imperial College London last month revealed that long-term use of cannabis destroys dopamine, the feel-good chemical in the brain that inspires a spirit of get-up-and-go.
Previous research has suggested taking marijuana can lead to individuals becoming withdrawn, lethargic and apathetic.
The cannabis users in the study published in Biological Psychiatry had all experienced psychotic-like symptoms while smoking the drug such as strange sensations or having feelings of paranoia.
The researchers expected their dopamine production might be higher since this has been linked with psychosis – but instead found the opposite.
The cannabis users had their first experience with the drug between the ages of 12 and 18 and the researchers believe the drug could be the cause of the difference in dopamine levels.
‘Cannabis is an illegal drug and there is mounting evidence the idea of it being a harmless herb is not true,’ said Dr Michael Bloomfield, of Imperial College London.
‘When people stop taking cannabis it seems the brain can slowly go back to producing pretty normal levels of dopamine.
‘Cannabis has effects on the brain and it’s important people can make an informed decision.’
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