"Salvia divinorum, or the ‘diviner’s sage’, is a rare member of the mint family (Lamiaceae; formerly Labiatae), characterised in the mid-twentieth century.
The plant is endemic to a limited area of the highlands of the Mexican Oaxaca state, where the Mazatec Indians ingest its fresh leaves or leaf preparations for divinatory rituals, healing ceremonies and medical purposes.
Since the late 1990s, the use of the plant as a ‘legal’ herbal hallucinogen has been increasing, partly due to its availability.
Smoking the dried and crushed leaves provides short-lived but intense hallucinations.
The effective dose of salvinorin A, the active ingredient of the plant, is comparable to that of the synthetic hallucinogens LSD or DOB.
The toxicity of Salvia divinorum is currently poorly understood."
Many of the members of the Salvia family contain differing amounts of Salvinorin.
I would recommend following the "all things in moderation" rule when ingesting any of the Salvias
Currently two studies are on going with salvinorin in the attempt to quantify the toxicity of the compound.
As for eating non documented members of the Mint Family, think about eating an unknown
mushroom, there is always a possibility.
There is a lot of information available on specific members of Salvia and other members of the mint family, a little research is always a good thing when trying something others aren't eating regularly.
Redhawk