Table 7 Correlation between dust exposure and change in lung function among 33 non‐smokers before implementation of the ban.

	Correlation coefficient	Significance
Total dust pre‐ban
Change in FVC	0.149	0.41
Change in FEV1	0.255	0.15
Change in FEF 25–75%	0.347	0.048
Nicotine pre‐ban
Change in FVC	−0.126	0.485
Change in FEV1	0.081	0.655
Change in FEF 25–75%	0.232	0.193