Different drugs affect different people very differently and some people can have a much harder time withdrawing than others, plus there are SO many variables that go into what someone's experience would be like quitting any drug, including GBL and heroin. But in general
most people seem to find quitting heroin or other opioids after long-term use and physical dependence
much more difficult than quitting GBL, especially after only a week or 2 of GBL use.
When you are referring to "addicted", you should actually be referring to
physically dependent, as they are 2 different things. People frequently mistakenly use "addicted" when referring to dependence-causing drugs to mean physically dependent, but that isn't correct, as being addicted to something can be solely mental and exist without any physical dependence. For example, someone can get
addicted to anything, even things that never create a physical dependence (gambling, shopping, marijuana, etc). They don't go through the same kind of physical withdrawal symptoms if they quit, but they still have a hard time quitting. You can be addicted to a dependence-causing drug without being physically dependent, for example someone who uses heroin 1 or 2x a week. Being
physically dependent means that your body has become accustomed to the drug and now needs it to function normally and that you will suffer physical withdrawal symptoms if you suddenly stop taking it.
From Wikipedia:
Frequent use of GHB/GBL, even when taken long-term and in moderate doses, does not appear to cause significant physical dependency in the greater majority of its users. In many people, quitting or temporarily abstaining from use of the drugs is achieved with minimal or no difficulty. However, when consumed in excessive amounts with a high frequency of dosing, physical and psychological dependence can develop.[8][9]
There are some reports of GHB/GBL users adopting a '24/7' dosing regime.[10] This is where the user has become tolerant to the effects of the drug, increasing the dosage and frequency of dosage.
For those users who do report withdrawal symptoms upon quitting the use of GHB/GBL, symptoms seem to depend on the dosage and the length of time the drug was used for. Light to moderate users often experience insomnia and sleep-related problems, whereas heavy, prolonged use can cause severe withdrawal symptoms similar to Benzodiazepine withdrawal syndrome
There is no way to know for certain whether you will have absolutely no withdrawal symptoms if you abruptly stop taking GBL after 10 days of use, as everyone is different and we don't know how much or how often you've been taking it, but it is very unlikely that you will suffer serious withdrawal symptoms. You may have some mental symptoms and cravings from being used to taking it, and you may have some trouble sleeping. Best idea (as with any drug) is to gradually taper your dose rather than stopping suddenly.