The term "professional" should be taken euphemistically here. You will likely have a much better time with someone highly experienced with hallucinogen usage rather than a scientist in lab conditions.
That may be true, but scientific and academic credentials do not qualify anyone any more than direct experience. Would you trust a spelunking guide that has 100 trips down a cave, or someone who got a PhD in spelunking without taking any actual trips?
On hacker news we are only allowed binary decision making no matter how analog the situation, but obviously the optimum solution is to talk to / work with both, although I'm guessing they aren't going to literally work with each other at the same moment. Which is really too bad. I could totally see a GP, Specialist, and Patient relationship developing.