Yes, it is very possible to get addicted to WikiTree. It is possibly to get addicted to anything if you enjoy it enough.
A gameaholic is someone who is addicted to games. Much like how an alcoholic is addicted to alcohol.
There's nothing in blood that will make a person addicted to drinking their own blood. If a person does get addicted for some reason, it's most likely a psychologically problem. Absolutely no, as a clinical addiction requires a physiological component. A psychological "addiction" more correctly a habituation, may however occur. Drinking your own blood is dangerous in that there is an infection risk. Also, there's the risk of masking other symptoms like a a gastrointestinal bleed. If you feel compelled to drink your own blood, I kindly suggest that some counselling may be helpful.
someone who is addicted to crack
Lazy.
It is someone who is addicted to dancing!! :D
they see hallucinations
A pin cushion.
A hardcore drinker is someone that is addicted to drinking...
someone who is addicted to crack and willl do ANYTHING to get it.
Fistpump fiend!!
I guess an eager scholar?