Overview: This e-brief offers an overview of the legal position in respect to e-cigarettes, along with a summary of research findings and viewpoints in the contemporary debate. It starts with a descriptive comment on e-cigarettes, making the point that e-cigarettes come in many forms, some containing nicotine and some not. It should be emphasised that this e-brief is only an introduction to the many complex medical, legal and other issues raised by e-cigarettes in their various forms.