Nicotine is a vasoconstrictor and reduces blood flow to the skin, likely reducing the availability of nutrients to keep your skin healthy.
Nicotine is nicotine.
Sorry about your habit. It’s a hard one to break (been there), but don’t ignore known science to justify it in your head just because there isn’t a full in depth study.
When you say vaping, the default assumption is you’re talking about vaping nicotine. Of course nicotine free vapes cannot be equated to smoking lmao. That’s on you for not specifying.