Cold turkey too. I'm not out of the woods yet, but the worst is over. I've never been addicted to such a high amount of nicotine before. Vaping allows one to consume nicotine more places than smoking, and at higher strengths of nicotine. The withdrawal hasn't been as bad as I thought. My anxiety and irritability has been rather low compared to other times I have quit. I have difficulty concentrating, I'm barely sleeping, I have a nagging headache, and everything physically feels hotter. I know these symptoms symptoms will gradually subside.
Good luck to anyone else trying to kick shitty habits picked up from the pandemic.