Salvia leaves have been dried and smoked for many centuries. Just like Datura, Belladona, Henbane, Absenthia, Valerian and , of course, Marijuana. And all of them are very easy to grow in an average backyard garden. And like all natural mind altering herbs, they have to be used in moderation. If you over-imbibe, then you will definitely see demons. And except for marijuana, none of these plants are illegal. Is that cool, or what?
Some of those plants mentioned are pretty poisonous. Like drop dead poisonous if consumed in the wrong manner or by the wrong people.