Yes, rockets do. However most of the really toxic stuff becomes much less toxic after it reacts. Mercury by contrast is bad, stays bad once it reacts with som

Yes, rockets do. However most of the really toxic stuff becomes much less toxic after it reacts. Mercury by contrast is bad, stays bad once it reacts with something, and once it gets in the environment quickly concentrates up the food chain to give you maximum odds of experiencing just how bad it is. Usual lethal doses are 1-4 grams, and occasionally less. See https://www.epa.gov/sites/production/files/2016-09/documents/mercury-compounds.pdf https://www.epa.gov/sites/production/files/2016-09/documents... for more on that. Mercury compounds generally don't get better than that, but they do get worse. For example 0.3 grams of https://en.wikipedia.org/wiki/Dimethylmercury https://en.wikipedia.org/wiki/Dimethylmercury causes a bad death, and famously goes through things like latex gloves. Filling a rocket with 30% mercury by volume may make the rocket go faster, but spewing metric tonnes of mercury all over your environment at each launch is..not recommended.