Most lists of examples of bad habits read like a scolding: nail biting, smoking, doomscrolling, done. That's not much use when you're standing in your kitchen at 11pm wondering why you're eating cereal again. What follows is a categorised list of common bad habits, but with two columns that usually get left out — what the habit actually costs you, and the smaller behaviour that tends to fit into the same slot in your day. That second column is where the change happens, because a habit you delete leaves a gap, and gaps fill themselves.
One scoping note before the list. This post is the menu — what bad habits look like, grouped and named. If you already know which one you're targeting and want the mechanics of quitting it, habit tracker for breaking bad habits covers the days-clean approach in detail. Read this first, pick one, then go there.
What makes a habit "bad" rather than just a choice
A habit is a behaviour that runs on a cue with barely any decision in between — you pick up the phone before you've decided to. The research on this is fairly settled: Wood and Rünger's review of habit psychology describes habits as context-cued responses that fire whether or not they still serve you. That's what separates a bad habit from a bad choice. The choice you weigh. The habit just happens, and you notice afterwards.
So the word "bad" here means something specific: repeated, automatic, and pointed away from what you actually want. Eating a biscuit is a choice. Eating four biscuits every evening at 9:15 because the kettle went on is a habit. Only the second one is worth putting on a list.
Examples of bad habits, by category
Grouped by where they show up in a day. The middle column is the real cost — not the moralising version, the practical one. The third is a replacement that occupies the same cue, which is what makes it stick.
| Bad habit | What it costs | The swap |
|---|---|---|
| Checking your phone before getting out of bed | The first 40 minutes of the day, reactively | Phone charges across the room; glass of water first |
| Hitting snooze three times | Fragmented sleep that leaves you groggier | One alarm, feet on floor, curtains open |
| Skipping breakfast then overeating at 11 | An energy crash you blame on work | Something small and repeatable, same time daily |
| Starting the day in your inbox | Other people set your priorities before you do | One task chosen the night before |
| Leaving your phone face-up on the desk | Every notification restarts your focus | Face-down, in a drawer, during one work block |
| Working with 30 browser tabs open | Constant low-grade decision cost | Close everything but the current task |
| Task-switching between apps every few minutes | Real measurable slowdown — the APA's work on multitasking puts the cost at up to 40% of productive time | One 25-minute timed block |
| Saying yes to every meeting | No uninterrupted stretch left in the week | One blocked afternoon, defended |
| Eating lunch at your desk | No genuine break, so the afternoon drags | Twelve minutes outside, no phone |
| Doomscrolling news at lunch | A stress spike right before the hardest hours | One podcast, one walk |
| Grazing while cooking | Calories you never account for | Set the table before you cook |
| Second coffee after 3pm | Sleep onset pushed 45+ minutes later | Herbal tea, same mug, same ritual |
| Drinking almost no water until evening | Headaches you attribute to screens | One glass per work block |
| Ordering takeaway when tired rather than hungry | Money and a decision you'd not make rested | One 10-minute meal you can cook on autopilot |
| Skipping the gym when the session isn't "worth it" | Weeks of nothing between perfect weeks | The 10-minute version counts |
| Sitting for four hours unbroken | Stiffness and an afternoon slump | Stand at the end of every timed block |
| Sleeping with the phone by your pillow | A 20-minute scroll before sleep, most nights | Charge it in the hallway |
| Watching one more episode past midnight | An hour borrowed from tomorrow | Episode ends, lights go off, no decision |
| Late-night snacking out of boredom | Poor sleep quality, not just calories | Kitchen closed after dinner; tea instead |
| Reading in bed on a screen | Wakefulness right when you want the opposite | Paper, or an e-reader with no browser |
| Nail biting | Nothing dramatic — but it's the anxiety tell you don't notice | Something in the hands: a pen, a band |
| Cracking on with work while stressed rather than pausing | Slower work and a worse mood | Two minutes of nothing before the next thing |
| Venting on social media | The bad feeling gets rehearsed rather than processed | Three lines in a notes app, unsent |
| Comparing your week to strangers' highlight reels | Motivation drops right when you need it | Unfollow ten accounts; keep the useful five |
| Buying the thing when the ad lands | Money spent on someone else's timing | The 48-hour list |
| Leaving dishes "for later" | A kitchen you avoid, so cooking dies too | The five-minute reset before bed |
| Letting laundry pile until it's a whole day | A chore that becomes a dreaded event | One load, same day each week |
| Saying "I'll remember" instead of writing it down | Low-level mental load all day | One inbox for everything |
| Rebuying motivation apps every January | The same fresh start, four times a year | Pick one, use it badly, keep going |
| Restarting from zero after one missed day | Weeks lost to the "ruined it" spiral | Miss one, log the next |
| Tracking twenty things at once | Every one of them half-done | Three, until they're boring |
| Planning tomorrow in your head at midnight | Sleep replaced with rehearsal | Two lines on paper, then done |
Thirty-two is more than anyone should act on, which is the point of putting them in one place. Reading down the list, one or two will land harder than the rest. Those are yours.
The pattern hiding in the third column
Look at the swaps and something repeats: almost none of them are "stop doing X." They're all do this smaller thing in the same slot. That's not a stylistic choice. A cue that has fired for years will keep firing — the kettle boils, the phone buzzes, the clock hits 9:15 — and if there's nothing waiting at the end of it, the old behaviour is still the path of least resistance. Give the cue a new ending and you're competing on much better terms.
This also explains why the hardest habits to break aren't the dramatic ones. Nail biting is easy to notice and easy to interrupt. The phone-before-feet-on-floor habit is neither, because it's welded to a cue you can't remove — waking up. Those need the cue rearranged physically, which is why "charge it in another room" appears three times in that table and "try harder" appears zero times.
Breaking one, rather than all thirty-two
Pick one. Not the worst one — the one whose swap you can picture doing tomorrow without preparation. Then track the replacement, not the abstention. A row of days where you drank water at 7am is something you can look at. A row of days where you "didn't scroll" is invisible, and invisible things don't build.
Give it three weeks before you judge it. And when you miss a day, treat it as one day. The abstinence violation effect — the APA's name for the collapse that follows a single slip when you'd framed the streak as all-or-nothing — is the single most common way these attempts die. One missed evening turns into "I've broken it," and "I've broken it" turns into three weeks off. If that's already happened to you this year, how to get back on track is about exactly that recovery.
Which ones actually matter
If you want a shortcut through the table: the sleep row and the phone-placement row do more work than the rest combined, because both of them upstream everything else. Bad sleep makes every other habit harder to run and every bad one easier to fall into. Phone placement decides how your first and last waking hour go, and those two hours colour the day at both ends.
Everything else on that list is real, but downstream. Fix where the phone sleeps and when the lights go off, then come back and pick a third. If you're not sure what to put in its place, what habits should I track works through choosing the ones worth the effort, and habits vs routines explains why a few of these only break when you treat them as a sequence rather than a single behaviour.
FAQ
What are the most common bad habits?
Across the categories above, the ones that show up most often are phone-first mornings, snoozing, screen use in bed, skipping breaks, eating out of boredom rather than hunger, and abandoning a routine entirely after one missed day. They're common because each is welded to a cue that fires every single day — waking, sitting down, getting tired — rather than one you can avoid.
How long does it take to break a bad habit?
Longer than the "21 days" figure suggests, and it varies enormously by behaviour. The UCL work most often cited on this found automaticity forming anywhere between 18 and 254 days depending on the person and the action. Simple swaps at a fixed cue land fastest; anything tied to stress or to another person's behaviour takes considerably longer.
Is it better to quit a bad habit or replace it?
Replace it, in almost every case. The cue that triggers the habit doesn't disappear when you decide to stop, so a habit removed without a replacement leaves an unfilled prompt several times a day — and the old behaviour is the one your brain already knows how to run. Giving the cue a new, smaller ending is a much easier fight than giving it none.
Should I track bad habits or good ones?
Track the replacement behaviour. "Didn't scroll" produces no visible record and no sense of progress, whereas "read ten pages" produces a row of completed days you can look at. Apps like init.Habits are built around logging what you did rather than what you avoided, and that framing matters more than it sounds — the record is the thing that keeps you going in week three.