Originally Posted by
BA850
It seems that G-XLEC was just south of St. John’s on Monday when it turned around and returned to Boston due to smoke reported in the cabin.
https://asn.flightsafety.org/wikibase/392423
It was in the air for about two hours after turning around, so presumably the crew identified the issue as non-critical. I’m sure more details will emerge in the coming days.
So based on a writeup on The Aviation Herald, it seems that the "smoke" was in fact fumes. But in this case it was a good dose of clean fun (along with headaches and dizziness) for all involved as the smell was reported to be laundry detergent.
Apparently after it landed in Boston it was noted that there were 5 pallets of laundry beads in the cargo hold.
https://avherald.com/h?article=51b01411&opt=0
You really couldn't make it up.