Abstract: EDITOR, - Larrson et al reported that out of 42 Swedish elite cross country skiers, 23 had asthma and 31 asthma-like symptoms.1 In 1984, 11.2% of the athletes in the United States' Olympic team had asthma induced by exercise.2 Thus, in elite athletes and espically in skiers symptoms of exercise induced asthma are common.1 Running is the most effective way to provoke such asthma,3 and bronchoconstriction in connection with exercise is exacerbated by inhalation of cold dry air or allergens.4,5 However, exercise induced asthma …