I remember people saying Mister Tambourine Man was a song about drugs.
I guess it all depends on whether you see the symbolism, or if you take song lyrics literally. Some songs make no sense if you interpret the lyrics literally.
It never struck me that either was about drugs; and I still don’t believe either one is.
After the theory that it was about drugs came out the author denied it. And continued to deny it.
The fact that someone sat down and decided all the lyrics were symbolism for drugs does not make that the intent of the composer.
It’s like gay activists finding any excuse to determine that some historical figure was gay.
That said, Lucy in the Sky with Diamonds was definitely about LSD (Just kidding. It isn’t.)