There are a number of factors that come into play and affect how much vapor an electronic cigarette produces. The following are some of them.
The Charge On The Battery.
If a battery is fully charged, it will result in much more vapor production since there will be sufficient power getting to the heating element in the atomizer. Conversely, when a battery is low on charge, it will result in minimal vapor production since the heating element will not be getting enough power to vaporize the e-liquid.
The Voltage Indicated On The Battery.
Batteries come with different voltage capacities, depending on the manufacturer of that battery. Batteries that have higher voltage will produce more vapor since a lot more power will be getting to the heating element. A 4V battery will for instance result in less vapor as compared to a 6V battery.
Has The Coil Heated Sufficiently?
When all the components of the e-cigs are identical yet varying amounts of vapor are being produced, chances are high that one of you did not allow the coil to heat sufficiently before vaping.
This is particularly true for manual batteries where a switch has to be flipped in order for electricity to move to the heating element.
Once you flip the switch and then immediately draw on the device, less vapor will be produced as compared to what would have resulted had you waited a few seconds before drawing on the e-cigarette.
There are many factors that affect vapor quantity but the most common are the ones indicated above. If you see that your device is not producing as much vapor as that of another person using the same brand of equipment, look into the factors discussed above and you will get an explanation for the discrepancy.
If you are still not satisfied, some of your hardware may be worn out and in need of replacement. Always maintain your hardware as advised by the manufacturer as that will assure you of optimal functioning and satisfactory vaping.