The journal of applied toxicology reports a medical study done at Kitasato University School of Medicine on the effects of inhaled monoethanolamine on bronchoconstriction.These results suggest that asthma-like symptoms may result partly from agonistic MEA effects at histamine-H(1) receptors and muscarinic receptors.This means non ammonia colors may aggravate or cause asthma in certain individuals. Just because you can’t smell it, doesn’t mean it’s not harmful.