Even after adjusting the figures to take account of the other known risk factors, marijuana use remained a clear risk factor for testicular cancer. Just being a marijuana smoker seemed to carry a 70% extra risk, while those who smoked it regularly, or had smoked from an early age, had twice the risk compared to those who had never smoked it. - http://news.bbc.co.uk/2/hi/7869709.stm
“For example, chronic marijuana use is associated with reduced hypothalamic release of gonadotropin-releasing hormone, decreased plasma levels of gonadotropins (follicle-stimulating hormone, lutenizing hormone, and prolactin) and testosterone, reduced spermatogenesis, and impotency in men.” - http://onlinelibrary.wiley.com/doi/10.10…
Britain's most senior coroner is warning that hundreds of young people are dying in accidents caused by their prolonged use of cannabis….The dangers of cannabis were highlighted in research published last month, which showed a sharp increase in drug-related deaths. According to the European Centre for Addiction Studies at St George's Hospital Medical School in London, in 2002, British coroners cited cannabis as the major cause of death in 18 out of 853 drug-related deaths. The drug was also implicated in a further 31 out of 1,579 deaths involving a cocktail of drugs. http://www.telegraph.co.uk/news/uknews/1…
Teens who routinely smoke marijuana risk a long-term drop in their IQ - http://news.yahoo.com/teen-pot-linked-la…
“Pre-natal marijuana exposure had persistent negative effects through age 16 on higher-order thinking, including problem solving, memory, planning, impulsivity, and attention.”
http://www.ncbi.nlm.nih.gov/pmc/articles…
Long-term heavy cannabis use in healthy individuals is associated with smaller cerebellar white-matter volume similar to that observed in schizophrenia. Reduced volumes were even more pronounced in patients with schizophrenia who use cannabis. Cannabis use may alter the course of brain maturational processes associated with schizophrenia. http://journals.cambridge.org/action/dis…