The Denver Broncos will have to play their next four NFL games without starting fullback Mike Anderson, who has been suspended for substance abuse.

Anderson confirmed to a Denver newspaper that he tested positive for marijuana. However, the player insisted that he inhaled nothing more than second-hand smoke from other people's smoking.

He will miss games against San Diego, Chicago, Oakland and Kansas City. He is eligible to play December 14 against Cleveland. The suspension will also cost him more than $371,000 - about one-quarter of his yearly salary.

His absence could be even more costly for the Broncos, who are currently 5-4 in the American Football Conference's West Division. Anderson has rushed for 198 yards and two touchdowns this season. He has also caught 10 passes for 42 yards and two touchdowns.