Exposure to marijuana and marijuana derivatives is optional. Exposure to lead is almost never optional.
https://newscenter.lbl.gov/2013/08/01/secondhand-smoke-in-ba...
https://pubmed.ncbi.nlm.nih.gov/29870518/
For controls on residential buildings, we would need better standards in shared housing construction and perhaps also we could take a look at better airflow and particulate filtration methods. I expect it will be some time (and perhaps another airborne pandemic?) for that to be addressed seriously.