"The danger is, of course, that Skype users may be less in the habit of being suspicious about links sent to them than, say, Facebook users, " said Sophos's senior technology consultant Graham Cluley.

BBC: Skype targeted by 'worm' malware infecting Windows PCs

The American habit of being on first-name terms from the start tends to shock.

ECONOMIST: Business travel

From the start, Smiley has a habit of being dragged out of retirement, like a badger from hibernation, to inspect the Circus, and, if required, erase disorder or rot.

NEWYORKER: I Spy

She thinks of herself as being, already, a victim of the habit.

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Films are at the very forefront of fashion and have chronicled fairly accurately the decline of the cigarette from being an enjoyment of the smart set to its present status as a dangerous habit.

BBC: NEWS | UK | Magazine | A Point of View

But psychiatry as a field has been skeptical of the idea of people being addicted to behaviors, because there is not proof that a bad habit is the same kind of biological issue as a dependence on alcohol, nicotine, or heroin.

FORBES: Is Sex Addiction Real?

Under such pressure, MoD orders already have a nasty habit of being stretched into the future.

BBC: Fog on the Clyde

When I shared these two simple ideas with about half a million people across a few social networks, at first people responded out of habit, with extremists ranting about fantasies of armed insurrection against the government or of hundreds of millions of guns being melted down.

CNN: On gun control, two places to start

Consistent with this, there is a case for restrictions on the way in which cigarettes are advertised and sold: because cigarettes are addictive and dangerous, children are at risk of being hooked by a bad habit before they are old enough to make a reasoned calculation of the odds.

ECONOMIST: Tobacco��s Brutus