As amazing as it would be to see Begbie, Renton and Sick Boy continue their drug-induced "Trainspotting" adventures, Scottish leading man Ewan McGregor has unofficially nixed it -- he's never even seen a script for the hypothetical movie.

While doing press for the upcoming "Salmon Fishing in the Yemen" at the Toronto International Film Festival last fall, McGregor addressed the possibility of starring in a sequel to the movie -- which was based on the novel by Irvine Welsh.

"I was always a bit loathe to do it, because 'Trainspotting' is so important for me," said McGregor. "And it was such an amazing film that still stands up today. I think making a sequel to it is almost a dangerous thing to do. You don't want to damage the reputation of the original film if you make a lesser version."

Upon reflection, McGregor briefly considered the semantics of creating the film now, over a decade after its original release in 1996.

"That said, it could be interesting because it's been so long, and the book is set 10 years later," he said, referring to Welsh's follow-up to "Trainspotting," titled "Porno."

As for his aging since the mid-'90s?

"I still look very, very young, and that would be a big problem," he joked, laughing.

Another novel by Welsh ("Ecstasy: Three Tales of Chemical Romance") has been adapted into a Canadian film, "Irvine Welsh's Ecstacy," which just wrapped shooting and is slated for release this year. Welsh is currently writing a prequel to "Trainspotting," titled "Skagboys."

Check back in a few weeks for our full-length interview with Ewan McGregor.