Saskatchewan RCMP have seized 400,000 unstamped cigarettes from a semi stopped near Lumsden.
The bust, which took place on Highway 11 last week, involved Highway Patrol officers who spotted two dozen pallets of illicit tobacco in the trailer.
RCMP Superintendent Murray Chamberlin said the cigarettes could have been worth millions on the illegal market.
A 24-year-old Brampton, Ontario, man faces charges under the Criminal Code, Excise Act, and Tobacco Tax Act.
RCMP arrested his passenger but later released him without charges.
Regina Police Service and Combined Traffic Services Saskatchewan helped investigate.
The investigation continues.