When it comes to finances, we can sometimes be our own worst enemies.

For many people, retirement is the most pressing financial issue. Pensions are disappearing, health-care costs are soaring, politicians keep talking about changing or shrinking Social Security benefits, inflation is marching on . this should all sound very familiar.

It's hard to believe, but millions of Americans have taken few or no steps toward securing a comfortable retirement. Many have not opened IRA accounts, and many don't participate in their employers' 401(k) plans. You're probably not in that group, though -- especially if you hang out at The Motley Fool.

Still, you probably could make your retirement richer by changing a few of your ways.

Let's avoid the latte
This is where we financial writers will often inject the "latte example," showing you how much money you could save by skipping those daily coffee splurges. I'll do something else instead, though -- I'll use smoking as an example. Whether it's a coffee habit or a smoking habit or something else, we can all do better.

Here's the math. Imagine that you're 35 years old, you smoke one pack of cigarettes a day, and each pack costs you, on average, about $5. Multiply $5 by 365 days, and you're looking at an annual cost of $1,825. If you took this $1,825 and invested it in the stock market, earning the historical average return of 10% per year, in 30 years you'd have $31,845. If you invested $1,825 in the market each year for 30 years, you'd end up with more than $300,000! All that from quitting smoking.

And you might not even have to quit entirely. If you smoke two packs a day and cut down to one pack, you'll save the same amount. If you cut out three $5 packs per day, you'll end up with nearly a million dollars for retirement (and much better odds of making it to retirement, as well).

Why $300,000 matters
As Robert Brokamp has suggested in our Rule Your Retirement newsletter, that $300,000 can make a huge difference in your life. He explained that in order to make your nest egg last, you should conservatively plan to withdraw about 4% of it per year in retirement to live on. So if you want to live off of $50,000 per year, you'll want to have $1.25 million socked away. Are you anywhere close to that? If not, then $300,000 might look a lot more important -- it's 24% of what you need!

My own example
I don't smoke, though, so you could reasonably argue that it's easy for me to talk about quitting smoking. I do, however, buy lots of books (as well as CDs and movies) online at Amazon.com, eBay, and eBay's Half.com. I generally buy them at half-price or less, but I still buy them, when I could (with a little more effort) find many at a local library.

If I spend $35 per week on these items, financially it's just like smoking one pack a day. By cutting out (or cutting back) this spending, I might net $300,000 for myself -- which is a considerable sum for me.

Of course, just plunking that money into the stock market won't necessarily net you 10% per year -- that's just the historical average. You might instead reap 6% or 13% or something else. You might increase your odds by investing instead (or additionally) in some carefully selected stocks. Just to prove that there are plenty of familiar names that deliver strong results over time, here are a few past performers:

Company 10-yr. avg. 20-yr. avg.
SanDisk (NASDAQ:SNDK) 32% N/A
Boeing (NYSE:BA) 9% 12%
Genentech (NYSE:DNA) 28% 15%
Whole Foods (NASDAQ:WFMI) 27% N/A
Eastman Kodak (NYSE:EK) -8% 2%

Oops! I guess this table shows, more than anything else, that not all familiar companies (like Kodak) will perform well, and that some unfamiliar companies may perform very well. It's critical to choose carefully.

Learn more
We can help you zero in on healthy, growing investments as you line up a secure retirement for yourself via our Rule Your Retirement newsletter. A 30-day free trial will let you peek at all the past issues, which feature retirement success stories and a wide range of other useful articles on planning for retirement and making smart investments. Try a free trial today -- you have nothing to lose, and plenty to gain.

These Motley Fool articles may also be of interest:

Here's to a happier portfolio!

Amazon.com, eBay, and Whole Foods are Motley Fool Stock Advisor recommendations.

Selena Maranjian hasn't bought a DVD or book online in several days. She owns shares of Amazon.com and eBay. For more about Selena, view
her bio andher profile. You might also be interested in these books she has written or co-written:The Motley Fool Money GuideandThe Motley Fool Investment Guide for Teens. The Motley Fool isFools writing for Fools.