Defined: ad·dic·tion əˈdikSH(ə)n/ noun
noun: addiction; plural noun: addictions
the fact or condition of being addicted to a particular substance, thing, or activity.

Example: I know more people that are addictive towards such items as texting, email, facebook, twitter, etc. Consequences? Isolation, depression, relationship trouble, wreck-less driving, and death. The National Safety Council reports that over 64% of the reported accidents in the USA (1.6M) were cell phone related. 37,000+ people die in automobile crashes in the U.S every year. Of the 421,000 people severely injured in accidents 78% of those accidents were cell phone related. I personally know of 3 close deaths, 5 severe accidents, several divorces, all due to quirky behavior? A third of all divorce filings in 2011 contained the word "Facebook," according to Divorce Online. Another quirky behavior.

Addictive behaviors are not a disease. They are people using irrational behavior. Whether it is drinking, substance abuse, social media, eating, gambling, sex, porn, binge watching TV, other internet compulsions, etc.

Conclusion; if you're contemplating whether your behavior is quirky or not you may want to do a 'real rational' cost benefit analysis and determine what are the exact potential consequence of the behavior if it carried out for long periods of time. If nothing then proceed.