my advise
go find a place after you have made it to dry it out for a while, maybe go for the hickery smoking method, but keep it out of the sun.
once you do that for a while put it in a jar with one of those silicate drying packs and keep it in a dark, stable temp place away from sunlight, maybe consider pouring some nitrogen gas over the top of the jar if your feeling a bit peckish, but even without the nitrogen this will last years.
your real concern is the moisture content, once you have that under control their really is very little you have to worry about.
and now im thinking about having a grand child poking through my old boxes, finding a jar of changa and being a stupid teenager rather than asking what it is decides to smoke it and is in for one heck of a surprise.
whole point being, get the moisture under control, keep it out of as much sunlight as you can and it will last for a very long time.