Now, a new study has confirmed the stereotype to indeed be true. Students who smoke large quantities of cannabis have lower grades and perform worse at school, say the scientists.
The researchers found 1,100 teenagers who had started College in the United States with similar rates of academic success for two years.
Without, however, all participants smoked different amounts of cannabis and consume different levels of alcohol.
Point average (GPA) data was followed by each participant, while also assessed the results of the tests above.
Adolescents were then divided into three groups: young little or no alcohol or marijuana, people who drank much, but not smoked manypot and large consumers of both substances.
They found that students who drank much, but non-smokers tend toget lower grades during the first semester of the University.
However, they were then achieve similar degrees compared with thesober students, according to the study published in PLOS ONE.
For the first half, the Group of mostly sober students had an averageGPA of 3.1 and drinkers had an average GPA of 3.03 - the equivalentto a B.
But for students who were heavy users of both substances, it continued to decrease their academic success. They had an average GPA of2.66, which is equivalent to a B or a C +.
Author of the study Dr. Godfrey Pearlson, from the Institute of living,Connecticut, said: 'Making a lot of both drugs had a significant impact in terms of lower grades in our study and other studies, with number of leaves of absences and those who dropped out of school.'
The study did not appear in final GPA, graduation rates or the difficulty of the courses chosen.
But the researchers say that their findings suggest efforts to limit theuse of the substance during the crucial first months of College can help more students succeed.
'For many students, high-performance during the first two years of College provides them with skills and confidence that will help boost their performance during the last years of College,' said Dr. Mark Olfson, a researcher in Psychiatry at Columbia University in New York, who was not involved in the study.
' The new findings make clear academic real risks to university students posed by the combined use of alcohol and marijuana weighing.
'Parents should be encouraged to have open discussions about alcohol and marijuana with their children before that to College.'
A study conducted by the Université de Montréal in Canada in January found that the marijuana had a particularly detrimental effect on young brains.
Teenagers smoking pot as early as age 14 were much worse in cognitive tests when reached 20 - years old and dropped out of school at one rate much higher than non-smokers.
WHERE MARIJUANA IS LEGAL IN THE UNITED STATES
28 States and the District of Columbia have legalized marijuana for avariety of medical applications.
Eight of those States, as well as the capital of the country, have also legalized the drug for recreational use.
The States are: California, Oregon, Washington, Maine, Nevada, Alaska, Colorado and Massachusetts.
That means nearly a quarter of Americans (more than 20 per cent) now have access to recreational marijuana and more than 60% to the medical variety.
But experts--among them the White House Surgeon General Dr. Vivek Gupta - legalization moves faster than the research.
Dr Gupta published a report in November urging careful with drugs,saying: 'marijuana is addictive'.
He referred to 'a growing body of research' suggesting marijuana chemicals can help to with ' pain, nausea, epilepsy, obesity, wasting disease, addiction, autoimmune disorders and other conditions '.
While Dr Gupta supports easing restrictions on marijuana studies, says that this is simply to accelerate our scientific understanding of thedroga-no as a green light for the Americans to smoke cannabismore.
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