Can you become physically addicted to lsd?

Yes: Lsd like most hallucinogens relies on activation of the reward system this is Dopamine related. Which means it feeds on the pleasure response. Other important aspects are the long term effect of post use hallucinations which can appera years later and complicate mental health including those with dual diagnosis

Dr Pizzo agreed

LSD: Biochemistry. Be careful you don't exacerbate an underlying condition in your brain that would provoke more hallucinations even when not taking LSD.