Good morning, Very Expert vaping Comrades.

Some of my DIY creations are now reaching a vapeable age, so I'm retesting and refining like a madwoman. (Most of them still need work, but that's not the issue at the moment). What's puzzling me here is the fact that my 6mg mixes seem too strong nic-wise, and I've had to mix everything down to 4mg.
Six mg was giving me a headache after about 20 minutes, but 4 mg seems perfectly fine.
Could it be that Vapers Tek nicotine is stronger than whatever is in my premixed Highbrow juices? I've rechecked the numbers 10 times, and I just can't think of any other answer.
Some of my DIY creations are now reaching a vapeable age, so I'm retesting and refining like a madwoman. (Most of them still need work, but that's not the issue at the moment). What's puzzling me here is the fact that my 6mg mixes seem too strong nic-wise, and I've had to mix everything down to 4mg.
Six mg was giving me a headache after about 20 minutes, but 4 mg seems perfectly fine.
Could it be that Vapers Tek nicotine is stronger than whatever is in my premixed Highbrow juices? I've rechecked the numbers 10 times, and I just can't think of any other answer.