Drug info - Some questions about Ketamine

[BrainMelt]

Swim has been using K about twice a month for over a year. He has found a few times that after a few hours of going at it, he cannot get the full effects anymore no matter how much K he sniffs. Is this normal? Shouldn't it still be possible to get in a K hole if you just do way more than before?

Also, swim has been finding himself having some weird thoughts when he is not on K and is wondering if his use of it is the reason. The main thing has been deja vu(events seem to have already happened before), but also thoughts that things are happening for some larger reason. Another has been, thinking that people he has never seen before look extremely familiar. Is swim going crazy or what?