There's a recently published study. On December 22, 2020 by a team of researchers from the University of San Francisco, California, USA. Led by Professor Stanton Luntz, the study of 64 published studies studied the relationship of e-cigarette use to quitting conventional smoking. It found that 55 pieces of research surveyed smoking quitting. In people who smoke e-cigarettes in their usual use, e-cigarettes do not lead to the cessation of ordinary smoking. Meanwhile, 9 pieces of research that experimented with e-cigarettes in treatment to quit smoking were regulated in accordance with research regulations. It has been found that e-cigarettes help to stop ordinary smoking.
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