User blog:Patrick x hunter/some nen ability's do not work

i realized that some nen abilitys i have read are not possible, or would take years and years of hard training i think that some conjuration abilitys would be super hard to do and take forever to train for. impossible for transmuters like me. e.g (sorry to who made this) toxic or poizin gas, you can not touch of feel or train with poizin gas so its impossible. transmuter powers would take a long time to train for if its possible. e.g i would want ice ( what i touch freezes). i would need years of living in a place of snow all year round and hold ice feel and everything else with ice e.g kinda like kurapika's training but for  a few years, 2 years  1 year or 3 maybe even 10 years of just ice. what are your thoughts?