It seems to be a reference to a quotation from a tv programme called The Honeymooners:
"You're a riot, Alice.. you're a regular riot."
This means literally "you are fun to be with, Alice, a lot of fun!", but is intended as sarcasm, and thus means "you are no fun at all".
(Unfortunately I'm not familiar with the programme, so I can't tell you who Alice is.)
In your context, the phrase "You're a regular riot, Alice" expresses a humorous objection to T's enforcing of the "smoking" forfeit.
All the best,
PS: There appears to be a recording of the phrase in its "Honeymooners" context here: