Oliver Stone (emphasis added):
"The Assassination Records Review Board (1994-1998) found that over 40 witnesses in two locations saw a large avulsive (i.e. penetrating outward) wound in the rear of JFK's skull. This includes highly qualified medical personnel at hospitals in Dallas and Bethesda, as well as FBI agents James Sibert and Frank O'Neill, who were at the autopsy in 1963 and restated it to the board. This wound again indicates an exit wound from a shot to the front. Conclusion: The president was shot from at least two sides, front and back — not one location."
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Quotes in the image to the left (and in the text below) are from the U.S. government's landmark 1999 Institute of Medicine (IOM) report, Marijuana and Medicine: Assessing the Science Base. The full text of the report is available for free online at the above link, and is searchable. The table of contents by chapter is on the right side. Quotes below are followed by their references. Emphasis added.
Page 109: "Indeed, epidemiological data indicate that in the general population marijuana use is not associated with increased mortality. 138"
Page 107: "When heavy marijuana use accompanies these symptoms [amotivation], the drug is often cited as the cause, but no convincing data demonstrate a causal relationship between marijuana smoking and these behavior characteristics. 23"
- 23. Chait LD, Pierri J. 1992. Effects of smoked marijuana on human performance: A critical review. In: L Murphy and A Bartke, Editors, Marijuana/Cannabinoids: Neurobiology and Neurophysiology. Boca Raton, FL: CRC Press. Pp. 387—424.
Page 119: "There is no conclusive evidence that marijuana causes cancer in humans, including cancers usually related to tobacco use."
Compare the IOM report quotes to this quote about tobacco: