"The Three Stigmata of Palmer Eldritch" is a fascinating book, as so much of P.K. Dick's stuff is. Another interesting drug, or rather drug system, is the one

"The Three Stigmata of Palmer Eldritch" is a fascinating book, as so much of P.K. Dick's stuff is. Another interesting drug, or rather drug system, is the one used by enhanced Culture people in Iain M. Banks' amazing novels. People are modified to the extent that they can secrete a number of different drugs at will, or "glanding", which allows them to get high/drunk and sober again among other things.