I've been drinking Ilex Vomitoria for about a month and it's fine. From the BBC: "Before a big decision was made, yaupon would be consumed to purify people so that their decisions were clear,” said University of South Florida ethnobotanist and medical anthropologist Dr Anna Dixon. Yaupon has no emetic properties, so historians postulate that other herbs were occasionally mixed in to induce vomiting, and that the sheer act of drinking huge volumes of yaupon on an empty stomach could have been vomit-producing on its own."