Tuna Kush Kief is a legendary BC kush strain that is known to be very potent. Anything over 25% is considered to be potent and this strain averages at around 27%! It is a very heavily indica-dominant hybrid with unknown breeders. However, many believe it to be a backcross or phenotype of Hindu Kush, which explains its potency and strong smell. For those looking for very heavy body relaxation with nice cerebral effects, this is THE strain for you.