They used to use cardboard smoker boxes, which I always thought (as a kid) was odd... I mean, wouldn't it burn up? But nope...
since the need is likely to be at higher temps, then you need a lot of salt, too. The salt has to be flushed out before the smoking, big pita. In areas with no access to sodium chloride, it's feasible to use potassium chloride, extracted from hardwood ashes, but it's a huge pita.