By the 1960s, LSD started popping up on university campuses around America. Word spread and it became popular with everyone from hippies to Hollywood stars, often taken in uncontrolled settings.

Rise of Recreational Use By the mid-1960s, LSD had gained popularity outside the clinical setting, becoming a symbol of the countercultural movement. Figures like Harvard psychologist Timothy ...

LSD is a relatively new drug, compared to many others. And its history has been influenced by some unlikely groups.