It isn't clear until you are suffering from allergies, and notice that old people who used to chew on lead fishing weights are not all that bad off. Most people with high lead in their bodies don't realize the issue nor to the people they know.
Chunks of lead just aren't that bad. https://doi.org/10.2146/ajhp060175 lists common sources of lead poisoning, and none of them are lead weights.
Common sources involve things like airborne lead powder (from grinding or smelting), lead compounds dissolved in food & water, paint, and lead in soil.
