does chewing tobacco affect ketosis and Blood Sugars Tobacco Use and Oral Health:

Tobacco Withdrawal and Fatigue: How to Explain This Phenomenon

So there is no such thing as a safe, or even safer, cigarette, and no safe level of exposure to the carcinogens in tobacco smoke

Limitations of the current research include the small number of studies, the small sample size, the evaluation mostly of first-generation devices, the limited investigation on which characteristics of the device and patterns of use (e.g., wattage, temperature) could be major contributors of exposure, and the evaluation of devices that are selected by the investigators but which do not necessarily reflect what the consumers are using

Lee, who also serves as associate dean for research in the College of Health and Human Performance, noted that youth access to tobacco remains a pressing public health concern