Butane Hash Oil (BHO) is a cannabis concentrate with a waxy or honey-like consistency made by extracting dried and cured cannabis buds using Butane. It is not the best-tasting or the safest concentrate to use due to its solvents, but it is the easiest to produce. That is probably the reason why this type of cannabis concentrate is popular with stoners.
Concerns over the production of BHO have risen over the years. Due to the nature of the solvent used, authorities considered it a dangerous process to conduct. Butane is a highly flammable solvent that easily combusts. There have been documented cases of Butane-started fires and injuries. Aside from that, unevaporated solvents in the concentrates impose health risks to users.
Despite being one of the easiest concentrates to make, authorities consider BHO illegal. In California, it is illegal to make, sell, and have a stash of BHO. Authorities consider it a felony to produce the concentrate because of its hazardous nature.