Addicted to Gambling is wrong. Simply blaming that gambling is wrong doesn't make any sense. Addiction to anything is bad.
sorry to say but addition of every thing is not wrong, but addiction to bad activities is wrong, if you are playing gambling with out any limit then it is wrong but if you are playing gambling in a good way and having some limit for playing gambling then addiction to such gambling is ok and there is nothing wrong in such kind of gambling.
An addiction to anything is wrong,even if you are addicted to a good thing,addiction is mainly a bad thing.
Addiction means that you have no control about something,which means you can not do anything to stop it and you are a slave of it.
For an example,an addiction for studying which can be considered by you as a good addiction,means that all you do all of the day is studying,you do not communicate with anybody which can cause you to have some psycho problems.