It's possible to see the whole human growth movement of the 1970s as a wish to continue the inward quest without having to put yourself on the line in the way you had to when you took 250 gamma of LSD. And I think all these other methods are efficacious, but I think it's the sheer power of the hallucinogens that puts people off.
We are like coral animals embedded in a technological reef of extruded psychic objects...All our tool-making implies our belief in an ultimate tool.