Yeah it can be. The dangerous part is the purging of the BHO. The horror stories you hear are usually amateurs using a hot plate and vacuume or something similar to purge because they don't have a proper oven. If you are just blasting for edible's, and not smoke, then just purging it in the open is ok. There is more residuals left in the product but it's not really harmful to eat. If you smoke the product it's more important to purge it with heat and pressure, which is why people jerry rig the process. It's pretty easy and cheap to do safely, but definitely not for everyone! I just prefer to make my edibles that way. I'm spoiled and have access to proper equipment through work though.