TORONTO - It remains to be seen whether Charlie Sheen will crash and burn during his appearance in Toronto tonight. Whatever happens, health officials are warning that there better not be any smoke.

Sheen has frequently been seen puffing on a cigarette during earlier stops on his "My Violent Torpedo of Truth" tour, which hits Massey Hall tonight and tomorrow.

Ontario Health Promotion Minister Margarett Best says public health inspectors will be watching to make sure Sheen doesn't light up onstage.

Best also offered Sheen help to quit smoking, saying he should call her directly or the province's smokers' quit line.

Actor Sean Penn caused a similar stir by smoking on stage during the Toronto International Film Festival a few years ago, which resulted in fines against a local hotel.

Tonight's show, in which the 45-year-old wayward TV actor is expected to appear onstage with his "goddess" girlfriends, will be followed by an official after-party at the club Muzik.

Sheen launched his offbeat tour (which hits Vancouver May 2) to boos and brutal reviews April 2 in Detroit and had some audience members demanding refunds.

He's since tinkered with the show, experimenting with a Q and A format. While audience reception has improved, overall reviews have been mixed.

As of yesterday evening, tickets to the Toronto shows were still available.

"He's not known as being a standup comedian, so what are people going expecting to see? I think, probably, a trainwreck. A trainwreck that's happening right in front of our eyes," says Nick Baxter-Moore, professor of popular culture and media studies at Brock University in St. Catharines, Ont.

"But I think it is partly people want to see what outrageous things he will come out with now. And of course, he is a celebrity, and we like to see behind the celebrity, to a certain extent."

Sheen -- whose film credits include "Platoon," "Wall Street" and "Hot Shots!" -- has had past problems with alcohol and drugs, as well as several brushes with the law.

Last month, his erratic behaviour and war of words with "Two and a Half Men" producer Chuck Lorre prompted Warner Bros. Television to fire him from the top-rated sitcom.

He's since launched a $100 million lawsuit against Warner Bros. and Lorre, hit the media circuit with bizarre, stream-of-consciousness musings, and impulsively ignited his "Torpedo of Truth" tour to drum up support from fans.

A company with ties to Sheen also recently applied to trademark 22 of his catchphrases, which also include "warlock," "Rock Star From Mars" and "Adonis DNA."

Several of his buzzwords are also emblazoned on mugs, ashtrays, hats and other merchandise available for purchase on his website.

The hard-partying star is going through a divorce with his third wife, Brooke Mueller Sheen, with whom he has twin sons (Sheen has two other children with his ex-wife, Denise Richards).

The idea that he could falter again or say something outrageous is part of the appeal for those who are buying tickets to his tour, surmises Baxter-Moore.

"I think the idea that you're there on the night that he melts down, totally, may be a big part of it."

The Canadian Press was told by a Sheen spokesman that no media passes would be granted for the Toronto shows.