DULUTH — A Duluth business owner is filing a lawsuit seeking to overturn a city ordinance banning sale or use of synthetic marijuana.

Jim Carlson, owner of Last Place on Earth, claims in the suit filed Monday that he will lose 50 percent of his business because of the local ban.

The Duluth News Tribune reports that Carlson is seeking a temporary restraining order to prevent its enforcement while the case works through the courts.

The city council passed the ordinance Aug. 30 banning “synthetic cannabinoids,” products commonly known by names such as K2, Spice and Mojo. It’s took effect on Sunday and is first of its kind in Minnesota.

Duluth City Attorney Gunnar Johnson said Wednesday he hasn’t been served with the lawsuit and couldn’t comment.