CBD is generally not habit-forming and most side effects are minor. CBD can sometimes cause nausea and general sickness. Like many oils and supplements, some people just do not digest CBD well. Digestion issues that can come from CBD include diarrhea, vomiting, and dizziness. These issues can be exacerbated by taking the wrong dosage of CBD for your body. Learning the right dose for you is important and can take time. A second side effect of CBD can cause drowsiness and lightheadedness, somewhat of an obvious side effect that some (people trying to get help with sleep) may view as a benefit. More side effects that can come along with taking CBD are loss of appetite and dry mouth. Unlike popular opinion and truth about THC and the munchies that often come with it, CBD can actually have the opposite effect.