There are several things that can affect vapor production.
1) Style of inhale is very important, you want to take a longer, slower, softer inhale. More like breathing, less like smoking.
2)
juice ratio, more vg will produce more vapor but too much for some set up can hinder the ability to wick fast enough and will result in dry hits.
3) voltage used, higher voltage will cause the coil to heat up faster and hotter. That will vaporize more of the juice faster, but just like the vg too high a voltage can result in dry hits.
4) lighting is one trick some you tube reviewers use, more light in the background will make the vapor appear to be more dense and give a bigger fluffy look. try
vaping late at night with minimal light and it looks like nothing is there.
5) moisture or humidity is another, I live by the everglades so pretty humid and my vapor production is double here, when in NY visiting family during the winter it is a lot less. get out the shower and take a couple of puffs, you will be surprised at the difference.
6) hydration is key also, drink plenty of water. just like the shower, drink a cup of water and take a few puffs, it should be better then before drinking that cup of water.