It certainly isn't advisable but as long as you don't swallow it the risk is low. If you DO swallow any, seek medical advice immediately, both lead and tin, the other dominant metal are poisonous and will dissolve is stomach acids then enter your blood stream. They both have the effect of reducing mental agility but more importantly, they are cumulative poisons. The rate they leave the body is slow so the concentration builds up to irreversible danger level before any serious symptoms are noticed.
Brian.