Answer
there is such a thing although I don't remember the correct term for it.
It is when a person only thinks about the other person and wants to be with them the whole time. Although most of the time its normal to be "addicted" to a person it might push the other person away if they think you are suffocating them.
Answer
I think "obsessed" is probably the more appropriate term. Yes, some people do become obsessed with another person. Sometimes this is simply a phase of the relationship that resolves over time; other times, the obsession is unhealthy.
Answer
Yes. Neurological responses in the brain when "falling in love" replicate those of drug use, but to a lesser degree. The brain floods with neurotransmitters that produce feelings of warmth and happiness. Who wouldn't want that?
However, feeling addicted to a person is referred to as being in a codependent relationship. There are many books and resources available to help one break free of this type of unhealthy love. Just Google "codependency".
yes you can become addicted to ibuprofen as it is a painkiller
No
All of these are correct
Addictive personalities play a significant part in how people become slaves to the fix.
They can be, but some people become addicted to gambling, and at that point, it is no longer recreational for that person.
Depends on your body. Some people get addicted quite easily, but some don't. For example a pack of cigarettes will be enough for one person to become addicted, and for other months are needed to become addicted (like me :D ).
Anyone can become addicted to the internet if they have a void to fill in their lives.
Drugs do not have the ability to become addicted
Obsessed is another word that can replace addicted.
A person who really likes wine is called an oenophile. However this term does not imply that the person is actually addicted to wine. A person who is actually addicted to wine is simply an alcoholic.
noDepends
You write it the same way you write any other story. Sit down and start putting ideas onto paper or into the computer! Write what it feels like to be addicted, what happens to the person who is addicted, why did they become addicted, and whatever else you can thing of!