If you sit in a position where decisions that you take would have a serious effect on people you can't ignore a lot of experience around the world which says this drug has these negative effects.
There are such beings as vampires some of us have evidence that they exist. Even had we not the proof of our own unhappy experience the teachings and the records of the past give proof enough for sane peoples.
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I think any spiritual experience that's worthwhile is not about ego and it will humble you in some way. And also a Zen monk once said to me 'If you're not laughing then you're not getting it.'
