Cannabis is shown to have a correlation with psychosis, depression, schiztophrenia, hyperactivity disorders. Cannabis can cause birth defects similar to Fetal Alcohol Syndrome, decrease in sperm count, infertility, and has a correlation to testicular cancer. Some studies have shown that users of cannabis have almost twice to three times as high dropout rates, and most detainees in juvenile correctional facilities have used or do use marijuana.
It also is really expensive. And, in most places, illegal.
http://en.m.wikipedia.org/wiki/Long-term_effects_of_cannabis
"Cannabis is shown to have a correlation with psychosis, depression, schiztophrenia, hyperactivity disorders. "
http://www.abc.net.au/science/articles/2009/09/01/2673334.htm
"Cannabis can cause birth defects similar to Fetal Alcohol Syndrome"
defects? no, slightly lower birth height and weight? possibly, although that isnt even conclusive. and comparing it to fetal alcohol syndrome is like comparing the common cold with leukemia.
"decrease in sperm count, infertility "
so do hot baths, soy based foods, greasy foods, many sodas, and a bunch of other things you ingest every day. unless you're a complete health nut (one that doesnt take hot baths and eat soy based foods), a lot of the things you do lower your sperm count.
" testicular cancer"
one good possibility for this correlation is that the study you are referring too was done in SEATTLE WASHINGTON, want to know what is legal for medicinal use there? you guessed it, marijuana! if this study was done somewhere were marijuana wasnt prescribed to cancer patients.. maybe we would have some conclusive evidence of a link between marijuana use and testicular cancer.
" Some studies have shown that users of cannabis have almost twice to three times as high dropout rates"
maybe because the kids CHOOSE to be a rebel and CHOOSE to drop out? you're going to blame the plant for this? its like blaming hitlers love of dogs for the holocaust. i for one, am a drop out, and a marijuana user, and marijuana did NOT lead me to drop out, and did NOT cause my grades to drop enough for me to want to drop out. in fact, my grades started dropping 3 years before i even started smoking marijuana, and the hopelessness of my situation caused me to drop out. marijuana had absolutely nothing to do with it.
"and most detainees in juvenile correctional facilities have used or do use marijuana."
maybe because the law PUTS THEM THERE. instead of properly educating the youth and making it harder for them to get by putting the marijuana market into the hands of people that ask for identification, america makes it out to be some crazy bad ass drug that you can get more easy than alcohol.
got anything else?