The burning question about precisely where a person can smoke these days is flaring up again in Ontario, where a 48-year-old trucker faces a $305 fine for lighting up on the job: while driving his big rig along Canada's busiest highway.

The man, who hails from London, Ontario, was headed for the border city of Windsor when he was pulled over along Highway 401 and given a ticket under the Smoke-Free Ontario Act.

The law, considered a Canadian standard-setter when it was passed in 2006, forbids smoking in all workplaces and enclosed public spaces, including buildings, structures or vehicles worked in or frequented by employees, according to the government's website.

Ontario's Liberal government, first elected in 2003, has been aggressive in its efforts to curb tobacco use in the province. Last summer, the province amended the Highway Traffic Act to prohibit smoking in cars carrying children.

Stringent anti-tobacco laws prohibiting smoking in covered public places and workplaces, like restaurants and bars, are also in effect in a number of other Canadian provinces and territories, including Manitoba, Saskatchewan, Quebec, the Maritime provinces, the Northwest Territories and Nunavut.