As for beginner, they get coughing when using e-cigs at the first time. the majority of these vapers have no idea what is the causative factor in this coughing. Now, this article is a part of answer.
1. Irritants In The Vapour
2. No Anaesthetics
3. Vaping Technique
4. Throat Hit
5. Dehydration
But after knowing these reasons, it gives you some solutions.
Try different techniques to find which works best for you
Try a different ratio of PG/VG
Try varying the nicotine levels contained in your e-liquid to see which affect your throat badly
Drink plenty of water to prevent dehydration
Change the speed at which you inhale – slower inhalation may result in coughing as less air will hit the coil of your e-cigarette
Change your exhalation speed – a slow and controlled exhale technique may reduce coughing fits
Try adding a small amount of menthol into your e-liquid
Adjust your Ohm resistance – an atomizer that has a higher Ohm resistance is better for preventing coughing, as lower Ohms of below 2.0 will result in a hotter vape which can be very harsh on your throat
Try a higher quality e-liquid – some of the cheaper ones use non-pharmaceutical-grade nicotine and this may also affect your throat.