I've felt kinda dizzy and lightheaded at times, but only when I lean over or lay down really quickly or something. And it's not bad at all, just a slight feeling.

If you're getting extremely dizzy (like, you need to sit down cause you're so dizzy), then maybe you should see a doctor. I wouldn't mention the weed though. If you're getting that dizzy, then it's probably not the weed's fault. Who knows, maybe you're anemic.