Better than Smoking

Greek study finds e-cigarettes no threat to heart

Farsalinos and his team examined the heart function of 20 young smokers before and after smoking one tobacco cigarette against that of 22 e-cigarette users before and after using the device for seven minutes.
While the tobacco smokers suffered significant heart dysfunction, including raised blood pressure and heart rate, those using e-cigarettes had only a slight elevation in pressure.

And they're cheaper, and they taste better, and they don't dry out your mouth.
If you are a smoker, I highly recommend you switch to vaping.