I don't think zero nic will help with the stress much, however it will give you the hand movements that come as part of being a smoker so that will help as it gives you something to help keep your mind of other things, Regarding my earlier post, it wasn't aimed at you, it was more of a generalization, you being an ex smoker clears up everything. There are folks out their that vape just to look cool, sadly vapers get tarnished with one image, full face bearded blokes and floppy hair, I think more vapers are middle aged like me, bald, no mustache, occassionally a goatee, etc but never a 1970's Peter Sutcliffe look alikes.
You couldn't get on with vaping before, truth is you didn't really want to 100%. Been there about 7-8 years ago then 2015 i really wanted to quit fags, so i spent tobacco money on juices and vapegear, giving me no choice but to vape when i wanted to smoke, I started on 18mg cut to 12mg 2 weeks later then tried DL vaping about 3 months in when the Horizon arctic tank came about. With the lower nic i went to 4mg and higher VG i found vaping much better no burning lungs which i was getting off the higher PG stuff at times now i am down to 3mg and have remained there for about 5 years. Vaping helps when stressed the same as a cigarette, its the nicotine that lowers the stress, studies are showing certain mental conditions benefit from nicotine use, stress is usually a cause to feel the need to smoke. So if you have been nicotine free for a while i wouldn't like you to re uptake it again but if it does help your stress then why not start using a lower strength liquid in a MTL set up, you can always ween yourself off it if you feel the stress has gone away making it easier for you to do so.
I wish you good luck in whatever you decide to do. As another ex smoker i don't want younger people taking up vaping or smoking, hence the Hip and Cool part. As another ex smoker we are on the same side.