hab·it
ˈhabit/
noun
noun: habit; plural noun: habits
1.
a settled or regular tendency or practice, especially one that is hard to give up.
"this can develop into a bad habit"
synonyms:custom, practice, routine, wont, pattern, convention, way, norm, tradition, matter of course, rule, usage More
informal
an addictive practice, especially one of taking drugs.
"a cocaine habit"
synonyms:addiction, dependence, dependency, craving, fixation, compulsion, obsession, weakness;
**Scrathing my ass in public is not a habit**