For whatever it is worth the study you linked to does not support your statement: " I just don't think that it is wise to legalize one more substance that has k

For whatever it is worth the study you linked to does not support your statement: " I just don't think that it is wise to legalize one more substance that has known and proven irreversible long-lasting effects..." From the study you linked: "Questions surrounding the effects of chronic marijuana use on brain structure continue to increase. To date, however, findings remain inconclusive." and "Despite the observed age of onset effects, longitudinal studies are needed to determine causality of these effects." Add to that this is one study that included only 110 people and was non-longitudinal. Do you have any other studies you can point to that have demonstrated' "known and proven irreversible long-lasting effects..." in chronic marijuana users? The linked study is helpful, but trying to prove something very controversial requires more evidence.