The FIS Nordic World Ski Championships 2001 took place February 15–25, 2001 in Lahti, Finland for a record sixth time, previous events being held in 1926, 1938, 1958, 1978 and 1989. These championships also saw the most event changes since the 1950s with the 5 km women and 10 km men's events being discontinued, the 10 km women and 15 km men's events return to their normal status for the first time since the 1991 championships, the debut of a combined pursuit as a separate category (5 km + 5 km for women, 10 km + 10 km for men), the addition of the individual sprint race for both genders, and the debut of the ski jumping team normal hill event. Extremely cold weather (−23 °C (−9 °F)) cancelled the women's 30 km event. The biggest controversy occurred when a doping scandal hit the host nation of Finland, resulting in six disqualifications. This would serve as a prelude to further doping cases in cross country skiing at the Winter Olympics in Salt Lake City the following year.
On 18 February, Jari Isometsä tested positive for use of hydroxyethyl starch (HES), a banned blood plasma expander. The test was carried out after the 15 km classical race, before the 10+10 km pursuit where Isometsä placed second. Isometsä admitted to using the HES product Hemohes and was immediately suspended.[9]
The Finnish relay teams won gold in the men's race and silver in the women's race. However, it was revealed on 25 February, the last day of the championships, that Janne Immonen also had tested positive for using HES. This led to the disqualification of the men's relay team (Norway thus won the gold medal). After further testing, four more cross-country skiers provided positive doping tests: Harri Kirvesniemi and Mika Myllylä, Milla Jauho and Virpi Kuitunen. The Finnish women's relay team was thus also disqualified, although Kuitunen was allowed to retain her gold medal in the 5+5 km pursuit. Kirvesniemi retired while the others served two year suspensions. The revelations led to the resignation of the medical staff of the cross-country team, and also the team leadership such as head coach Kari-Pekka Kyrö.
Coinciding with the doping tests, Finnish newspaper Helsingin Sanomat revealed on 26 February that a woman had found a suspicious bag at a petrol station near Helsinki Airport. The bag contained several vials with what was later revealed to be HES-products and other products such as adrenaline and asthma medicines. The incident occurred after the last World Cup races before the championships, held in Otepää in Estonia only a week before the opening.[10]