"pot" being an old expression for cannabis.

"A London ordinance of the fourteenth century forbade chimneys made from wood, requiring the use of less combustible materials! Writing in 1577, Harrison regrets the "increase of chimneys because all want them", blaming on their newfound popularity a deterioration in the nation’s health, if not a collective national loss of backbone. "Now we have many chimneys, and yet our tenderlings complain of rheumes, catarrhs, and poses. Then we had none but reredoes and our heads did never ake. For as the smoke in those days was supposed to be a sufficient hardener for the timber of the house, so it was reputed a far better medicine to keep the good man and his familie from the quack or pose, where with as then verie few were oft acquainted."
By the time of Charles the Second (1660) chimney pots had become status symbols, and were duly taxed. According to Fletcher “they were considered such important status symbols that the taxes were willingly paid.” However, it is during the nineteenth century that chimney pots reached the height of their popularity, and there were not many stacks built that century that were not surmounted by one of these outrageous chessmen. It was a trade that flourished and declined leaving scant trace of its history bar the pots themselves. “Perhaps no craft has declined so unsung and so unrecorded".

While it is possible to trace the history of English ceramics in great detail, scant record remains of the story of the men, women and, almost certainly, children who produced these glorious follies. One wonders what their reaction would have been had you told them that their handiwork would be crossing the Atlantic Ocean a hundred and fifty years later to the USA.”

First get turned to stone. (There are a few witches on this site, I'm sure one can oblige). Then get a stonemason to hollow you out. It might be an idea to make the arrangements with the stonemason first and he will probably want to be paid in advance.