Flashbacks and panic attacks are correlated with cocaine abuse for months, well after the last incident of cocaine use. During the 1950-1960's many psychiatrist traveled to Mexico to buy and take hallucinogens such as peyote. Why would an educated professional with an MD degree travel to a far-away country such as Mexico to take an illegal substance. Psychiatrists are paid a great deal of money to help people understand their problems and it would be absurd for them to abuse drugs. Besides, LSD was available anywhere in the US thanks to Sandoz Laboratories.
Psychiatrists have an MD degree and can legally take whatever drug they want.
In the early days, getting peyote in the US was difficult and traveling to Mexico was a short plane ride. Psychiatrists are seriously interested in helping their patients. Mental illness is one of the most serious problems facing our society. These dedicated doctors took drugs to induce an altered state that they hoped would provide insights into the diseased brain. Their work helped to promote Biological Psychiatry.