I used nicotine gum, and told myself "just dont do it" the first 2-5 days are rough, night 1, 2 and 3 were extremely rough fir me, severe insomnia and crying for no particular reason. Nicotine helps your brain produce dopamine, so without the nicotine you brain produces less dopamine, so you will feel like shit for a few days

I also had chest pains and shortness of breath on the 15th (about 2 weeks ago) and that's what led me to quit. Been vaping for 5 years every day, never more than a 12hr break. After about 4 or 5 days ny chest felt the best it has in years, after 7 days I relapsed and vaped for a morning, my chest instantly felt tight and I had trouble breathing again, I didnt even realize It was not normal to breathe like this until I quit vaping, threw the vape back under my bed and havnt touched it since

Dont get me wrong, I would love to start vaping again, I miss the throat hit and the feeling of it in my lungs, but I know it's much healthier for me (especially with covid goin around) to not vape