Possible Clues:

• Place to buy and smoke dope
• Establishment where dried narcotic juice of the poppy could be smoked
• Old-time drug hangout
• I run mad occasionally in public haunt in old Chinatown?
• Setting for part of 'The Picture of Dorian Gray'
• Drug establishment at the centre of Dickens's The Mystery of Edwin Drood
• Place frequented by John Jasper in Dickens' 'The Mystery of Edwin Drood'
• Place frequented by John Jasper in Dickens' "The Mystery of Edwin Drood"
• Wherein one gets stoned — awful dump, I gathered
• Somehow impound E in place frequented by drug addicts