OK, people, first off - PCP is NOT NOT NOT NOT NOT formaldyhyde. Formaldyhyde will most likely kill you if you smoke it. It's a very deadly chemical. PCP itself started a s ahorse tranquilizer and was outlawed because they ruled it to be animal cruelty to use it on horses. It shuts off all the receptor nerves in your body at high doses, hence the feeling of invincibility. It's not a pain killer, it's a feeling oblitorator. From what I've gathered (and take this post with a massive grain of salt, this info is all based on word of mouth) it's extremely difficult to make right without a huge lab and all kinds of chemicals and stuff, so actual pure 100% PCP is EXTREMELY hard to find and usually VERY expensive. the pcp you often find in joints or cigs or straight is made cheaply with lots of cut corners, and can be dangerous. In its pure form its a straight up delerient/halluginogen/PNS (peripheral nervous system) depressant.

That's my two cents worth, feel free to discredit me, this is just what i've gathered from talking to people.