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 Many risks remain unknown. Marijuana contains over 400
 separately identified chemicals. No one knows all the
 effects of burning these chemicals together and inhaling the
 burnt mix° Are these risks outweighed by medical benefits?
 There are scientific studies showing pure THC (Delta-9-
 Tetrahydrocannabinoi)_ one of the many chemicals found in
 marijuanas has some effect in controlling nausea and
 vomiting. Pure THC is pharmaceutically made in a clean
 capsule forms called Marinol_ and is available for use by
 the medical community. More information on Marinol can be
 found in the _Physicians' Desk References _' available in most
 libraries.
 Since marijuana contains THC_ you might think marijuana
 also would be effective. However, the effect of taking a
 drug in combination with other chemicals is seldom the same
 as taking just the pure drug. As already noted, marijuana
 contains over 400 other chemicals_ not just THC. There are
 no reliable scientific studies that show marijuana to be
 significantly effective in controlling nausea and vomiting.
 People refer to the Sallan study as proving marijuana's
 effectiveness° They are mistaken° The Salian study
 involved pure THC_ not marijuana. People refer to the Chang
 study to support marijuana's effectiveness. They also are
 mistaken. Doctor Chang tested the combination of pure THC
 and marijuana to treat nausea and vomiting. The preliminary
 results he got were probably due to the THC, not the
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