I live in a mid size, not a major or large city in a medical state. We have maybe 10 dispensaries here. I like to stock up on my favorite strains because their availability here comes and goes. If kept in a dry, dark cupboard how long will they last? Is it similar to prescription medication where it loses something like 5% potency a year? For example will a 90% THC cart be at like 80% or something like that after 2 years? Any clue?