When did George Harrison stop taking LSD? Why?

The Beatles famously brought LSD to public attention. Less well known is that George Harrison became rapidly disillusioned about the effects of the drug on young people exposed to it. His last LSD trip was in the late summer of 1967.

In Anthology, George confirms Derek Taylor's earlier revelation it that was a trip of the legal type that changed his perspective. In August 1967 he made an impromptu personal visit to Haight Ashbury, San Francisco. This was the epicentre of the supposed cultural revolution but what greeted was sordid and threatening. 

We were expecting Haight-Ashbury to be special, a creative and artistic place, filled with Beautiful People, but it was horrible - full of ghastly drop-outs, bums and spotty youths, all out of their brains.  Source

With the crowd building, Taylor began to fear for their physical safety:

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