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 with the drug.

While Paul had talked about LSD 'opening his eyes', George became concerned about the effects of the drug on young people. His last LSD trip was in the late summer of 1967. 

Haight Ashbury

In Anthology, George confirms Derek Taylor's earlier revelation that it 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. 

Haight Ashbury was celebrated as the epicentre of the supposed cultural revolution. But the scenes that what greeted Harrison were 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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