Not exactly. A lot of poisons such as lead, arsenic, mercury, etc build up over time. When they reach a certain amount, they will kill you, but the effects before that are minimal if not present at all.

The reason your body develops antibodies to diseases is that diseases have genetic information to them that can be read, analyzed, and dealt with. Toxins and poisons may be organic, but that doesn't mean they can be broken down any further than they already are. In order for your body to form an immunity to a poison, it would have to be able to either neutralize it or convert it to something else which, in a lost of cases, isn't possible.

You may develop resistance to the effects of a poison, but you are not invulnerable to it.

you dont understand how antibodies work do you?

ya i'll agree stuff like murcury your body would have a hard time marking because its elemental in its form

Elemental in form? What does that have to do with anything?

because its elemental in its form, think about it
lol

the fact that its so small? one of the only ways to remove it I think is through combination with other elements into a non-hazardous byproduct

(witch might require a REAL antidote

Might require? Is this for real? If you get poisoned with heavy metals you have a next to zero chance of survivability if you don't get treatment. And as said before, there is no immunity to poison, only resistance. Immunity only occurs with viral or bacterial infections. And trying to increase your resistance by scratching yourself seems a lot more dangerous to me than getting to a hospital and receive the proper antidote.

well... my mom was exposed to Mercury and shes not dead

But her body has been affected by the Mercury, she probably has a greater chance to develop cancer than someone who has never been exposed to mercury. This is part of your body's natural resistance to mercury, and cancer is the side effect. You can actually never be Immune to bacteria, you can be resistant to bacteria just like Poisons because bacteria secrete toxins just like an injection of poisons, these bacterial poisons are either exotoxins or endotoxins, exotoxin is released passively, endotoxins are released only when the bacteria dies, which is why some illnesses worsen when you administer antibiotics, which proves my point that you are never Immune to poisons your body simply resists the side effects through its immune system. Viruses however are in a different category because they reproduce by modifying genes in the cell and either creating new mutant cells or budding off of the cell wall and basically making the cell burst with new virons. In effect when your specific immune system recognizes a weaker version of a virus, it now has the ability to recognize viral cells. From here Garethsir it gets very very confusing. In any case bacteria/poisons tend to fall under non-specific immunity and viruses fall under specific immunity.

But our body uses plenty of elements...