I see what you're saying: If you gave someone a strong addictive substance without them knowing, then stopped giving it to them, would they still crave it.

Interesting question. I don't think they would crave anything in my opinion, but if they did become addicted to something, then stopeed and suffered withdrawl, they would still get sick, without any craving. If they were unaware of taking a substance, then they wouldn't know what to crave.

So I think, they would experience all the withdrawl symptoms, similar to a bad flu, but no craving. They would still sweat, vomit and all that stuff, but they would figure it's the flu.