Bad health habits are literally taking years off your life, according to a new Canadian study. But we have strategies for curbing the worst offenders.

We have bad news and good news. First, the bad: whether it’s being a couch potato, smoking, letting one glass of Chardonnay turn into the whole bottle, or indulging in a giant bowl of chips and dip, our most beloved vices are killing us. Or rather, they’re drastically reducing our life expectancy, says a new study recently published in the peer-reviewed journal PLOS Medicine. It found that smoking, eating junk food, vegging out and drinking can actually slash almost six years off the life expectancy of both men and women.

The study, authored by Dr. Doug Manuel, a senior scientist at The Ottawa Hospital and professor at the University of Ottawa, focused on the worst habits, which contributed to nearly half of all deaths reported in Canada. Using a predictive algorithm Manuel and his team created, population health surveys at the individual level were examined to learn just how dangerous these vices can be. The findings were dramatic—“smoking, by itself, was associated with 32% to 39% of the difference in life expectancy across social groups,” the study says.

But that’s where the good news comes in: though their impact can’t be understated, you can combat unhealthy habits—or at least tame them. Here are the 4 guilty pleasures that are worst for your health, and what you can do to curb them.

1. Smoking

While only about 20 per cent of Canada’s total population smokes, it is still the reigning health hazard for Canadians. When lighting up again, remember that the overall loss of life expectancy is an estimated 2.8 years. Coming up with a smoking cessation plan can help you butt out.

2. Eating Junk Food

A poor diet can shave off 1.2 years of your life, so we think it’s safe to say that giving into your sweet tooth at every craving is not a good call. To head off that 3pm junk food craving, don’t skip meals, and keep healthier snack options on-hand.

3. Physical Inactivity

With all the hours you put in at the office, it can be hard to find the opportunity and motivation to head to the gym. But yoga, Pilates, running or even going on 15-minute walks will add an extra 2.6 years onto your life. The solution? Changing your perspective.

4. Consuming Alcohol

Drinking has the least impact of these four vices—drinking contributed to a two-week decrease in life expectancy, but we know heavy drinking impacts your health in other ways. That’s why it’s important to drink with restraint.