Here’s my Q&A column from the WSJ this week — and if you have any questions for me, you can tweet them to @danariely with the hashtag #askariely, post a comment on my Ask Ariely Facebook page, or email them to AskAriely@wsj.com.

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Dear Dan,

I’ve been drinking soda for the past 15 years, and I’m trying to stop. I’ve tried phasing it out by switching to water some of the time and having a soda here and there, but I usually cave in to temptation by the end of the day. Is there a better strategy?

—Andrew 

Getting off soda gradually isn’t going to be easy. Every time you resist having one, you expend some of your willpower. If you’re asking yourself whether you should have a soda whenever you’re thirsty, you’ll probably give in a lot and gulp one down.

So how can you break a habit without exposing yourself to so much temptation and depending on constant self-control to save you? Reuven Dar of Tel Aviv University and his colleagues did a clever study on this question in 2005. They compared the craving for cigarettes of Orthodox Jewish smokers on weekdays with their craving on the Sabbath, when religious law forbids them to start fires or smoke.

Intriguingly, their irritability and yearning for a smoke were lower on the Sabbath than during the week—seemingly because the demands of Sabbath observance were so ingrained that forgoing smoking felt meaningful. By contrast, not smoking on, say, Tuesday took much more willpower.

The lesson? Try making a concrete rule against drinking soda, and try to tie it to something you care deeply about—like your health or your family.

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Dear Dan,

I’ve been living with a roommate for six months, and we divide up the household responsibilities pretty evenly, from paying the bills to grocery shopping. He says, however, that he feels taken for granted—that I don’t acknowledge his hard work. How can I fix this?

—C.J. 

This is a pretty common problem. If you take married couples, put the spouses in separate rooms, and ask each of them what percentage of the total family work they do, the answers you get almost always add up to more than 100%.

This isn’t just because we overestimate our own efforts. It’s also because we don’t see the details of the work that the other person puts in. We tell ourselves, “I take out the trash, which is a complex task that requires expertise, finesse and an eye for detail. My spouse, on the other hand, just takes care of the bills, which is one relatively simple thing to do.”

The particulars of our own chores are clear to us, but we tend to view our partners’ labors only in terms of the outcomes. We discount their contributions because we understand them only superficially.

To deal with your roommate’s complaint, you could try changing roles from time to time to ensure that you both fully understand how much effort all the different chores entail. You also could try a simpler approach: Ask him to tell you more about everything he does for the household so that you can grasp all the components and better appreciate his work.

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Dear Dan,

Is it useful to think about marriage as an investment?

—Aya 

No, because the two things are profoundly different. You never want to fall in love with an investment because at some point you will want to get out of it. With a marriage, you hope never to get out of it and always to be in love.

See the original article in the Wall Street Journal here.