Hiccups are a classic symptom for too much nicotine, likely from vaping too much. Smoking a .... had a definite stop point, when the filter started burning you had to stop. Vaping taste much better and it's easy to keep puffing for hours, basically chain vaping, instead of chain smoking. If you get hiccups, stop vaping for a while and wait a little bit for your next "vape break"
Sometimes it comes down to
"Put the PV down and back away slowly, keep your hands where we can see them and nobody gets hurt"....
p.s. Welcome to ECF!!
