I copies and pasted this more recent study done with the Rhesus Monkey's. It is sad the baby monkeys were sacrificed; indeed it is quite but here's what the scientists found out on the topic.
["I]THE FACTS
There is no evidence that marijuana impairs male reproductive functioning. The Jamaican and Costa Rican field studies detected no differences in hormone levels between marijuana users and non- users. In epidemiological surveys of marijuana users, no problems with fertility have emerged as important.
The claim that marijuana impairs female reproductive functioning in humans has no support in the scientific literature. There have been no epidemiological studies indicating diminished fertility in female users of marijuana, and a recent survey found no impact of chronic marijuana use on female sex hormones.
CLAIM #7: MARIJUANA USE DURING PREGNANCY HARMS THE FETUS
A powerful accusation in anti-drug campaigns is that children are permanently harmed by their mothers' use of drugs during pregnancy. Today, it is commonly claimed that marijuana is a cause of birth defects and development deficits.
THE FACTS
A number of studies reported low birth weight and physical abnormalities among babies exposed to marijuana in utero. However, when other factors known to affect pregnancy outcomes were controlled for-for example, maternal age, socio-economic class, and alcohol and tobacco use-the association between marijuana use and adverse fetal effects disappeared.
Numerous other studies have failed to find negative impacts from marijuana exposure.
In another study, standardized IQ tests were administered to marijuana- exposed and unexposed 3 year-olds. Researchers found no differences in the overall scores.
CLAIM #8: MARIJUANA CAUSES BRAIN DAMAGE
Critics state that marijuana damages brain cells and that this damage, in turn, causes memory loss, cognitive impairment, and difficulties in learning.
THE FACTS
The original basis of this claim was a report that, upon post-mortem examination, structural changes in several brain regions were found in two rhesus monkeys exposed to THC. However, to achieve these results, massive doses of THC-up to 200 times the psychoactive dose in humans-had to be given. In fact, studies employing 100 times the human dose have failed to reveal any damage.
In the most recently published study, rhesus monkeys, through face-mask inhalation, were exposed to the equivalent of 4-5 joints per day for an entire year. When sacrificed seven months later, there was no observed alteration of hippocampal architecture, cell size, cell number, or synaptic configuration. The authors conclude that: "while behavioral and neuroendocrinal effects were observed during marijuana smoke exposure in the monkey, residual neuropathological and neurochemical effects of marijuana exposure were not observed seven months after the year-long marijuana smoke regimen."
While there is general agreement that, while under the influence of marijuana, learning is less efficient, there is no evidence that marijuana users-even long-term users-suffer permanent impairment. Indeed, numerous studies comparing chronic marijuana users with non-user controls have found no significant differences in learning, memory recall, or other cognitive functions.
CLAIM #9: MARIJUANA IS AN ADDICTIVE DRUG
It is now frequently stated that marijuana is profoundly addicting and that any increase in prevalence of use will lead inevitably to increases in addiction.
THE FACTS
Essentially all drugs are used in "an addictive fashion" by some people. However, for any drug to be identified as highly addictive, there should be evidence that substantial numbers of users repeatedly fail in their attempts to discontinue use and develop use-patterns that interfere with other life activities.
National epidemiological surveys show that the large majority of people who have had experience with marijuana do not become regular users.[/I]"
I got this info from here. "exposing marijuana myths: a review of the scientific evidence" on the ol web. People are interested. This plant has too many medicinal properties to be so railroaded.
anyway, take it as you may and have a nice day
