Just a pin head drop on a cig or joint will do ya. Each drop is equivalent to a Joint , maybe a bit more. You can vaporize also but its just smoke like smokin a joint just gives a nice hash flavor to your Kool .....

As for eating Hash Oil ( or Hash or pot ) it must first be subjected to a temperature hot enough and long enough for each THC molecule to loose a H2O molecule for most cannabinoids to become psychoactive. Thats why you need to Bake Brownies, and fire up that joint. Same applies to Oil it must have reached a temp for a period of time to break off a water molecule. If produced by extracting with a method where its dried at above 212 deg f for a time it can be eaten and effect had.