If you use both e-cigarettes and smoke cigarettes at the same time, you run the risk of developing a condition known as nicotine poisoning. Taking in too much nicotine at once can cause a variety of symptoms, including nausea, vomiting, dizziness, confusion, a racing heart, and even death
There's also formaldehyde, a cancer-causing ingredient of embalming fluid
These products helped define the global perception of full strength cigarettes and remain everyday choices for smokers seeking consistency and bold taste
Holsboer, Inhibition of Macrophage Differentiation and Function by Cortisol, Endocrinology, July 1990;127(1):47680
References Slama K: Global perspective on tobacco control