Well tequlia is supposed to made from the mescal plant. I'm sure while that was the case in the 19th century they have been making without using the cactus for many years now.
But when I was a we lad there was a mescal tequlia that you could only get in Mexico that was supposed to be made from the mescal plant. I used to have my Father pick up a bottle since he went back and forth in a light plane. I didn't bother to tell him about the what was in it part. He thought it was just Tequlia.
We drank it expecting the Indian Gods to come and show us the true meaning of life. All we got out of it was double vision, extreme nausa and one hell of a hangover. I think that was just a something somebody made that there was real mescaline in that stuff.