Hashish
In general, THC smoked or orally consumed, upwards of 3 grams seems to be relatively safe even though 3 grams of pure THC is around 100 moderately strong edibles. However, smoking cannabis seems to be physically impossible to lethally overdose for someone relatively healthy. Many people smoke grams of hash oil at a time, wanting to achieve a state that "no man's gone before", with the absolutely worst thing happening is a pale face, vomiting, and inability to move as much as usual.