Hello fellow drug users of Reddit!

I have recently found out I developed pneumonia, not too big of a deal to me other than the fact that now I must quit my drug use for a prolonged time while I take my medication to help it go away. I know of course the majority of the time pneumonia can come from mostly smoking as well as other uncommon things, however I’ve never ever had any symptoms and I’ve been smoking for a long time. The only recent change is I recently started snorting ketamine but instead of blocking both of my nose holes, I directly placed it in my nose and inhaled directly, could this have lead to it or would it be the obvious answer that it came from smoking?