That would be appreciated, Dakmar.
Thanks.
The other study that has caused concern was concluded by Dr. Robert Heath at the Tulane University School of Medicine. Heath recorded the brain waves of six rhesus monkeys before, during, and after exposure to marijuana smoke and found that the monkeys showed changes for as long as five days after such exposure. In addition, two of the monkeys suffered "structural alteration of cells in the spetal region of the brain," and Heath stated that previous correlations between monkeys and human beings suggested that the chronic smoking of marijuana produces irreversible damage in humans.
Heath's report was made public at a Senate subcommittee hearing investigating marijuana and health. Dr. Julius Axelrod, who received the Nobel Prize in 1970 for his work on the effects of drugs on the brain, was asked to evaluate the Heath study. He told the senators that the amount of smoke inhaled by the monkeys was equivalent to a human being smoking over a hundred marijuana cigarettes each day for six months. "The results indicate that marijuana causes an irreversible damage to the brain," said Axelrod. "But the amounts used are so large that one wonders whether it's due to the large toxic amounts Dr. Heath has given." A large enough dose of almost any substance will produce negative results in animals or human beings, said Axelrod, who believed that Heath should have administered doses of varying degrees to determine which effects would have been produced by different levels of marijuana. Lester Grinspoon, another critic of the Heath study, points out that the monkeys in the experiment were forced to ingest excessive amounts of marijuana smoke, although a monkey's lung size is only about one-fifteenth as large as that of a human being.