I vaped 0 nicotine with peppermint flavor for about a year or so after I tapered down from the highest possible nicotine I could find using a box mod.

I've only been completely off the vape now for about 2 months but I allowed myself about 6 years to eventually work down to the 0 nicotine mix and I feel zero negative effects on my lungs. (Anecdotal, of course.)

I really only finally quit because I lost my favorite vape and decided I didn't really miss it all that much.