Howdy y'all. I've been working on a novel for a while now (mostly planning, a little bit of actual writing has been done, but not much) and my issue is this: I don't know how to portray my MC's cocaine addiction. In the novel, he's not quite a full-on junkie yet, he's sort of teetering on the edge. Problem is, I don't quite know how to write this. Any suggestions?