Des Moines cancer surgeon Dr. Charles Goldman said Mackenzie should be studied, not punished for developing his marijuana ointment.
Mackenzie said he would have liked to move to a state that allows medical marijuana but that wasn't an option because he remained on probation in Iowa.
California Dr. Jeffrey Hergenrather said he believes cannabis oil has helped battle cancer in several of his patients.
"It's very easy to recognize cannabis has a profound role in killing tumors," said Hergenrather, a 1975 graduate of the Brown University School of Medicine, now the Warren Alpert Medical School, in Providence, R.I.
Information from: Quad-City Times, http://www.qctimes.com