Among asthmatics, 57.8% report fragrance sensitivity (64.3% US, 55.6% AU, 54.0% UK, 57.3% SE); that is, adverse health effects from exposure to fragranced products. The most common adverse health effects were respiratory problems (37.7%), mucosal symptoms (25.4%), asthma attacks (25.0%), migraine headaches (22.6%), and skin problems (17.1%)
Steinemann, A. and Goodman, N. (2019). Fragranced consumer products and effects on asthmatics: an international population-based study. Air Quality, Atmosphere & Health.
Full article (free): https://link.springer.com/article/10.1007%2Fs11869-019-00693-w pdf: https://rdcu.be/bAUZK