Lightheadedness, nausea, and vomiting are common side effects of nicotine withdrawal, which is a low bar for the nicotine naive.
I recall, when I was at the School of Infantry after boot camp, one of our instructors told a kid he could get off firewatch if he survived the entire class with a dip in his lip. Kid said ezpz, give it to me. Instructor doles him out some cope long, kid puts it in, and the instructor immediately rolls the garbage can right up under his chin and says you're gonna need this. And like five minutes later he did.
I've never liked the nicotine "high," so I'm fortunate.
It definitely is, dunno why I threw withdrawal out. Maybe overdose is what I was looking for, but it was time to get the kids to school. Haste makes waste, as my mom used to say.