Drug use self-discipline disintegrates and motivation for learning.
The high consumption of drugs among students creates a climate in school that is destructive to learning.
Research shows that this may cause a drop in school performance. It has been found that this is true for students who excel in school before taking drugs, and for those who have behavioral problems at school or before eating. According to one study, students who use marijuana are twice as likely to get a lower average than others. Often low grades began to improve when you stop using drugs.
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Quite a few years ago I have been saying (and here are my articles) that 