fMRI Study of the Neural Mechanism of rTMS in the Treatment of Nicotine Dependence

The goal of this clinical trial is to investigate the efficacy of treatment and the efficacy-related neural network mechanisms by stimulating the left dorsolateral prefrontal lobe with rTMS to nicotine dependent. The main questions it aims to answer are: * Efficacy of left dorsolateral prefrontal rTMS in the treatment of nicotine dependent subjects. * The relationship between therapeutic effect and the internal function of the large brain networks of ECN, DMN and SN, and the changes in the interaction between the networks.