How come I can't vape as much as when I smoked analogues?

[Lobes2011]

I use to smoke a pack a day and now that I am almost converted over to vaping I seem to have a few puffs off my vapor (eliquid is 50/50 6 nic) and that's all I can take. If I were to take about 5 big puffs in a row I will feel light headed and gross. So after a few puffs I am good for about a half hour or so. My brother in law can puff on 18 nic and then have a smoke then keep puffing on the vapor. I just don't understand. Please respond thanks

 

[DavidOck]

I can't see it being the nic level, so maybe try some different PG/VG mixes. Some people have problems with one or the other.

And if you're taking lung hits, that could also be the issue. Try drawing into the mouth, and then down.

OTOH, if you're vaping to get off cigs, and a few hearty puffs gets rid of the urge for a half hour or so, is that really a problem?