Unfortunately, I think you can only talk about consciousness in the Neuroscience world if you have a Nobel prize. However, I think the argument still stands that it's a reasonable assumption that your entire conscious facility derives from the brain. Unless you want to make an argument for a soul, then it's fair to assume neurons and glial cells are the responsible parties.
Do we know for certain that quantum effects within neurons don't contribute to consciousness? No, but the most parsimonious answer would likely be that that's not the case. We have neither evidence nor reason to require such a mechanism to exist. What do neurons lack that cannot account for consciousness? If you can answer that, then I would allow the possibility of some other force in effect.