It isn't the same as addictive drugs like opiates and opioids and other classes, and synthetic or natural does not necessarily make a difference other than arbitrarily. In fact,
some synthetic analogues can be less harmful than their natural counterparts (e.g. opium addiction/withdrawal can be worse than morphine or diamorphine)! If you suffer real physical withdrawals then you are addicted, if not you're habituated. But that doesn't diminish the power of habituation, indeed sometimes the lack of physical withdrawal symptoms may make habituation harder to control.
Sugar and fructose et al are not healthy things to consume, but they are only a part of the big picture regards Ultra Processed Foods. The food (UPF) industry is somewhat analogous to the tobacco industry and alcohol industry in their misanthropic business practices. But UPF's are so prevalent is hard to totally avoid them.
And worse, some of the most contentious products are aimed quite deliberately at children and teens - e.g. breakfast cereals and tinned and bottled flavoured drinks.
When a UPF is labelled as "Part of a healthy diet" or some such nonsense, it doesn't mean it's healthy itself, just that there's nothing to stop you eating it on top of an otherwise healthy diet (other than your health)!
Caveat - my own diet is atrocious! It's seems knowledge isn't always power!
(This has been a Hypocrites Forever™ posting from Troll's 'R Us®
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P.S. I could wax lyrical much more on some of the other harmful aspects of UPF's, but you'd get too bored to read it!