I have done it a dozen times, when i was in my wild teen-age years.

A few times i combined it with acid, wich was amazing. Most of the times i made tea of 25 to 30 leaves and some other parts of the plant.

One time though, i decided to boil the leaves in water to make a slightly stronger extract. Thing is that it wasn't slightly stronger, it was way, way, way stronger then the tea i normally used to make.

I also noticed that sensitivity to the substance varies from person to person. A friend of me totally freaked out on the tea, i thought was not too intense.