(31) Notwithstanding other subsections of this section, (i) the possession of a small amount of marihuana only for personal use; (ii) the possession of a small amount of marihuana with the intent to distribute it but not to sell it; or (iii) the distribution of a small amount of marihuana but not for sale.
For purposes of this subsection, thirty (30) grams of marihuana or eight (8) grams of hashish shall be considered a small amount of marihuana.