We know a lot more now than we did. There’s a generation or two of chemists, pharmacists, etc who habitually mouth pipetted common lab solvents that we now kno

We know a lot more now than we did. There’s a generation or two of chemists, pharmacists, etc who habitually mouth pipetted common lab solvents that we now know to be carcinogenic. As early as 1969 chemists were identified as having increased cancer risk https://pubs.acs.org/doi/abs/10.1021/cen-v047n008.p014b https://pubs.acs.org/doi/abs/10.1021/cen-v047n008.p014b