Hypocrisy or irony?

There is a notice behind the bar in "The Ancient Mariner", a pub in Nether Stowey, south Somerset.

The notice states: "All persons found with drugs on these premises will be banned from this and all other local Public Houses, and will have their names notified to the Police"

Presumably alcohol & tobacco don't count as drugs these days?

And why is the pub called the Ancient Mariner? It's in honour of the poet Samuel Coleridge, who lived in the cottage opposite the pub whilst he was writing some of his most famous poetry, including The Ryme of the Ancient Mariner, and Kubla Khan.
And what was Coleridge also famous for?

Taking massive amounts of opium, that's what.
No drugs, indeed.