"Self-Pollution."

Cheers, Rhub. Yes, that sounds about right for teecha terminology - and back then it probably wouldn't be applied to smoking, which would be the first association these days.
But what would the kids themselves have called it?

"Jerking off"? Or did we get that from over the Pond? Hang on, this could be time to get into tsuwm's slang references.

Sorry to hear about the pollution-free weekend. Sad to say most of us have to spend a little time in the Garden (usually with the sprats)...