Panic, is a pain in the ...
Have had panic issues since my teenage years. I can tell you what I went through and hopefully you can control your panic.
Quitting smoking CAN give you panic attacks (it did for me) As you go through withdrawls you can be a mess.
For me: ecigs CAN give you panic attacks. I started out ecigs with 0mg as I was in the midsts of quitting smoking so I didint want the nicotine. Had a few panic attacks at first and couldnt figure out why. But panic can be some deeper issues you may not be aware of yet. When I first started ecigs, I ordered PG. Straight PG does not agree with me. I always felt "odd" after vaping, even with 0mg. The "odd" feeling would trigger an attack. I felt better after trying VG.
With Nicotine. I've since switched from 0mg to a low 4-6MG VG base. I tried a 10MG at first, guess what? It gave me a panic attack! As others have said, to much nic can do this to you. Even with the lower MG, if I over do it, it can trigger one. Remember Nicotine is a stimulant. Coffee is too! Combine the two and bam!
As much as I enjoy vaping (even more so now that Ive tried with Nicotine) There still feels like something is missing, and with some of these others posters are saying about WTA or whatever they are called, I can totally see it. But for me at this point, its been 2 years since my last real cigarette. Dont want to introduce anything new. Im good....I havent vaped the whole time either. I use it recreational. I like it, but it doesn't give me that complete satisfaction that a smoke did...but hey that comes with a price of bad health, being smelly, etc. Vaping fits the bill, I can do without.
Probably the biggest piece of advice I could offer: Keep hydrated! I think that is one big glaring issue with ecigs, is that i can dehydrate the heck out of you. Ease up on the coffee. Caffine can also dehydrate you. Try some herbal teas, chamomile is great for panic. I used to hate the mere smell of it, but now I drink lots of it and actually like it now. Can help ease up the tension, and keeps your mind occupied. I know its hard, but put down the ecig every now and then! People seem to over do it, and we are all assuming that this is harmless to our health. The jury is still out on that, we dont know. Whats freaky, is that there seems to be more "up front" side effects that come up when people make the switch to ecigs. I think alot of that is over use, but hey Im nor a DR or anything. My motto has always been: all in moderation. Vaping should be no different. I treat it like a smoke. Have to stop what I'm doing to vape. While I dont have to go outside anymore, I go to a "designated" vaping area of my house (basement). I dont vape infront of my kid, or nieces....Still get panic attacks once in a while, but they are fewer triggered by ecigs.