Very random interjection there, unless I missed something? I won't be drinking any of that, or Sarsaparilla, now that I know it causes hallucinations and cancer. The FDA must have felt like they had a productive day that day!
Well, sassafras and sarsaparilla both contain safrole, a compound recently banned by the FDA due to its carcinogenic effects. Safrole was found to contribute to liver cancer in rats when given in high doses, and thus it and sassafras or sarsaparilla-containing products were banned.
Sassafras is a hallucinogen that's also known as methylenedioxyamphetamine (MDA). You might also hear it called sass or sally.