Are there any good examples of commonly ingested molecules that contain particular toxic individual elements? In the house on my own and an article popped up on my feed with the following statement:


  While the Government has insisted the chemical is safe, cadmium is
  recognised as a cause of lung cancer and during the Second World War
  was considered by the Allies as a chemical weapon.


The proceeding paragraphs are about zinc cadmium sulphide.

full article

I think this is a flawed argument, essentially inferring that any given molecule can be said to be toxic just because one of it's component parts is toxic but I can't think of a good example to back this up.

What is a good example of a common compound that is ingested often (daily?) but contains a particularly toxic element if that element were ingested in some way on it's own?
Table salt! What would be worse than putting sodium (it can spontaneously combust if you get it wet) and chlorine (used as a war gas in WWI) all over your food?

Then there's water which always contains some $\ce{OH-}$ (an active ingredient in Drano) and $\ce{H+}$ (that stuff eats through metal, man). Although those aren't elements.

And hiding inside every $\ce{O2}$ molecule are two deadly oxygen atoms; once freed, they'll wreak havoc on just about anything they come into contact with.