Been feeling a lot better physically, which is a huge deal for me because the entire reason I ended up vaping was because I have MS and smoking definitely accelerates disease progression. Is it bad? Probably not 100% risk-free. Is it massively better than smoking? Absolutely. I can hike and kayak for hours - something me as a smoker struggled with. I sleep better and can breathe.
Now, real talk, I vape max VG or VG heavy liquids and have experienced a serious (for me) ezcema flare-up in areas that come in contact with the vapor. (Chin mostly, I suspect dehydration is a factor.) Sometimes my digestive system seems out of control, but nicotine stimulates that kind of thing so it's prob my fault for chainvaping 6mg on a subohm tank. My gums have been extra bleedy which happens with increased circulation after quitting smoking and I've been extra phlegmy - lungs cleaning themselves I suppose. Or I'm a little allergic to PG and haven't had bad enough problems to switch to 100% VG.
I second the idea about upping nic level if you're getting anxious. That's classic nic withdrawal.