According to the CDC, 1-in-5 workers in the US — more than 33 million Americans — regularly use tobacco or electronic cigarette products, Medpage Today reports.

Construction workers and repair/installation/maintenance workers had the highest overall tobacco use by occupation (34.3% and 37.2%, respectively). For cigarette smoking in particular, the highest rates were among construction workers and food/accommodation industry workers (24% and 25.8%, respectively).

Physical and social science workers had the lowest tobacco use by occupation (9.3%), followed by educators/librarians (9.5%), and healthcare workers (11.7%).