Does Smoking Fewer Cigarettes Reduce the Risk?

Cutting down is better than nothing, but much less than you’d expect: the risk of heart disease and stroke from smoking falls far less than the number of cigarettes. Smoking even one cigarette a day carries around half the excess heart disease risk of smoking twenty. The only way to remove the risk is to stop completely. Cutting down still has a place, as a step towards quitting, and counting is how you see it working.

This article is general information, not medical advice. A health professional or a free quit service can greatly improve your chances of quitting.

Why Fewer Isn’t Proportionally Safer

In a meta-analysis of 141 cohort studies, Hackshaw and colleagues compared people who smoked one cigarette a day with those who smoked twenty:

• Men who smoked one a day had about 46% of the excess risk of coronary heart disease of men who smoked twenty a day.
• Women who smoked one a day had about 31% of it.
• The pattern was similar for stroke.

In other words, cutting from twenty to one removes only about half to two-thirds of the excess heart risk, not 95%. Long-term low-intensity smoking also carries a higher risk of death: in a large US study, Inoue-Choi and colleagues found that people who had consistently smoked less than one cigarette a day had a 64% higher risk of dying during follow-up than never-smokers.

Cutting Down to Quit

Cutting down can still lead to quitting. A 2019 Cochrane review by Lindson and colleagues found moderate-certainty evidence that reducing first and then quitting works about as well as quitting abruptly, over the long term. Reduction seemed to work better with medication, such as fast-acting nicotine replacement or varenicline. So if a sudden stop feels impossible, a planned reduction towards a quit date is a reasonable route.

How Counting Helps

• It shows your baseline. Many people don’t know how many they smoke until they count.
• It shows when you smoke. Patterns by time of day or situation, such as after meals or with coffee, are what a quit plan works around.
• It makes a reduction plan concrete. Halving in two weeks, then a quit date, is a plan you can follow.

The World Health Organization’s tobacco fact sheet notes that most smokers who know the dangers want to quit, and that help, such as counselling and medication, makes success more likely. Free help is available in many countries, such as through Smokefree.gov in the US.

Following It in Kaizora

Cigarettes Smoked is on the Activities page, summed, so a day’s value is its total. Log each cigarette, or a day’s count, with Log. A habit such as “at most 10 cigarettes a day”, lowered step by step, follows a reduction plan, and a 7-day window, such as “at most 50 in 7 days”, tolerates one bad day; see Habits. Kaizora notifies you on the day a habit you’re staying under first goes over.

The Short Version

• One cigarette a day carries about a third to a half of the excess heart risk of twenty.
• Cutting down is not a safe level; stopping is the goal.
• Reducing then quitting works about as well as stopping abruptly, especially with medication.
• Counting shows your baseline, your patterns, and your progress.

Sources

• Hackshaw A et al., “Low cigarette consumption and risk of coronary heart disease and stroke: meta-analysis of 141 cohort studies in 55 study reports,” BMJ 360 (2018): j5855. doi:10.1136/bmj.j5855
• Inoue-Choi M et al., “Association of long-term, low-intensity smoking with all-cause and cause-specific mortality in the National Institutes of Health–AARP Diet and Health Study,” JAMA Internal Medicine 177, no. 1 (2017): 87–95. doi:10.1001/jamainternmed.2016.7511
• Lindson N et al., “Smoking reduction interventions for smoking cessation,” Cochrane Database of Systematic Reviews 2019, no. 9: CD013183. doi:10.1002/14651858.CD013183.pub2
• World Health Organization, Tobacco and nicotine (fact sheet).