That bears out the the Loctite Safety Data Sheet that Brian referred to which says:
"Prolonged exposure to high concentrations of vapours may lead to chronic effects in sensitive individuals."
Even the experts in the field cannot say whether there are long term effects:
"The available toxicological information is limited,
with no meaningful data on genotoxicity or on repeated
exposure (including carcinogenicity and reproductive
toxicity). There is also no clear understanding of the
mechanism(s) of the bronchoconstriction reactions"
So it makes sense to take reasonable precautions.
