Soon after Srila Prabhupada's earthly lila, Jayatirtha (one of the "eleven appointed ISKCON gurus) became a big advocate of LSD calling it the "sacrament". He believed that the soma referered to in shastra was a psychadelic tonic. He gradually became so bewildered that he was having affairs with his follower's wives, thinking it was spiritual. His so-called lila ended when he was beheaded by a disciple in the U.K. in the mid to late eighties. When Srila Sridhar Maharaja first heard of Jayatirtha's predeliction for psychadelic drugs he said LSD stands for "leads to spiritual death". (Jayatirtha already had a relationship with Srial Sridhar Maharaja and was posing as a standard devotee). He wondered how could western devotees think that something material can give something spiritual and would quote from Bhagavatam, bhaktya sanjayate bhaktya, "only bhakti can give bhakti." And who is bhakti?
One time in the 70's a devotee in the temple left for several weeks to go back out into "Maya". He came back in an extemely enthusiastic and faithfull mood. I was inquisitive about his new determination and he told me that he had a very wonderful vision of Krsna while on LSD. The temple president told us how a few years earlier a girl had come to the temple while Prabhupada was there and how she insisted that she had seen Krsna on LSD. Prabhupada tried to explain to her how it was more a less an hallucination, but she insisted that she had a vision of Krsna on LSD. Srila Prabhupada finally said, "Alright you have seen Krsna, now serve him."
The big difference between my devotee friend I mentioned above and Jayatirtha is that my friend did not take LSD with the intention of having a spiritual experience nor did he take it again. Jayatirtha on the other hand founded a psychadelic version of the Krsna Consciousness Movement and the result was chaos and finally his own destruction.
Srila Sridhar Maharaja would tell the story of a man who used to show pilgrams, "Krsna in a tree". In one open area there was a tree several hundred feet from the road and from that distance if you looked closely it seemed you would see Krsna in his three fold bending form. The whole thing became quite popular. Finally the man came to the Math and Srila Sridhar Maharaja explained to him how he was simply cheating others. Srila Sridhar Maharaja said, "We don't want that Krsna, we want the Krsna who is very difficult to attain." The main surrendered and became Srila Sridhar Maharaja's disciple.