is weed or tobacco more harmful Marijuana may be even safer than previously thought, researchers say Smoking and High Blood Pressure:
Description
doi:10.1353/hpu.2013.0173

Okay, you found one

Those are the worst kinds of people

[PubMed] Jeon J, Meza R, Krapcho M, Clarke LD, Byrne J, Levy DT

doi:10.2196/jmir.8550

Chemicals including heavy metals, pesticides, organic solvents et al