Long-time smokers who quit have much more vivid dreams!
According to research, smokers that have quit smoking experience dreams that are much vivid than normal. The Journal of Abnormal Psychology published an article that shed light on research among 293 smokers. They were monitored between 1 and 4 weeks. 33% of people reported having at least 1 dream about smoking, and felt strong emotions such as panic or guilt.
The dreams, and the vividness of them are a result of tobacco withdrawal, since 97% of them did not have them while smoking, and their occurrence was related to abstinence and the dreams were as common as most major tobacco withdrawal symptoms.