The following are common triggers: dust mites, animal dander, pollens, indoor molds, cockroaches, tobacco smoke, infections, strong odors, stress, exercise, respiratory infections, aspirin and aspirin-like drugs (ibuprofen), and hormones
in others, there is sporadic mention of native use of indigenous tobacco in explorer and trader journals after the 1790s (23), as well as some ethnographic evidence that native peoples used and sometimes cultivated indigenous tobaccos (2429)
At first, the answer was English indentured servants
Anti-smoking advocates in Canada have urged Ottawa to adopt similar measures, which Health Canada has previously said it has no plans to pursue