Without actually smelling it, you can look up what solvents are used in its manufacturing. In the case of PCP, it’s organic solvents like ether, benzene or alcohol. Bulk, non-lab grade solvents may contain bitterants that never get completely washed out of the final product.

The bitterants and any residual solvents should give it a weird alcohol-like smell. I suspect that PCP is also soluble in gasoline as well so it may have a note or two of that smell, depending on the availability of proper solvents. (As an example, diesel fuel is used quite often in cocaine manufacturing and as a result, it’ll have gasoline notes,so the same concept applies. So yeah. If your blow always smells like gas, that is one reason why. On the bright side, it’s probably a bit more pure but no guarantees on that.)