I have a microdiscectomy on July 2nd at 10:00 AM. None of the literature I got from Pre-op mentioned anything about tobacco. From what I can assume, I shouldn't vape for at least 12 hours, probably 24 -- Nicotine leaves the system in around that time frame. Anyone know for sure? I vape about 2 mL a day at 17 mg. In case that helps.