Smoking

Summary

  • Smoking increases all-cause mortality mainly by raising the risk of cardiovascular disease, cancer, and chronic lung disease, which leads to more premature deaths.
  • Across large long-term cohort studies, current smokers typically lose about 7–11 years of life compared with never-smokers.
  • Risk follows a clear dose–response: more cigarettes per day and more years smoked generally means higher mortality risk.
  • There is no safe level: even low-intensity or nondaily smoking increases all-cause mortality compared with never smoking.
  • Quitting works at any age, and the longer you stay smoke-free, the closer your risk gets to that of never-smokers.

Factor description

This factor measures a person’s current smoking status and history of tobacco smoking. It usually captures:

  • Whether you smoke now (daily or not daily)
  • Whether you used to smoke but quit
  • How long ago you quit (time since quitting, in years)

Most assessments use self-report. Some studies also use biomarkers (like cotinine), but KamaLama’s categories are typically based on self-reported status and time since quitting.

Impact on all-cause mortality

  1. Main pathways to higher mortality
  • Cardiovascular disease: smoking accelerates atherosclerosis, increases clot risk, raises inflammation, and damages blood vessels, which increases heart attack and stroke risk.
  • Cancer: smoking exposes the body to carcinogens that increase the risk of multiple cancers (especially lung cancer).
  • Chronic lung disease and infections: smoking damages airways and lung tissue, increasing COPD risk and vulnerability to respiratory illness.

These cause-specific deaths add up to higher all-cause mortality because they are common, serious, and often occur earlier in life.

  1. Dose–response pattern (more exposure, more risk)
  • Studies consistently show a graded relationship: higher intensity (cigarettes per day) and longer duration (years smoked) are linked to higher all-cause mortality.
  • No clear safe threshold has been identified. Even nondaily or low-intensity smoking shows elevated risk versus never smoking.
  1. Cessation effect (risk falls after quitting)
  • After quitting, mortality risk declines over time. The size and speed of recovery vary by prior intensity and duration, and by how long ago quitting occurred.
  • Earlier cessation generally restores more lost years, but quitting later still provides meaningful benefit compared with continuing to smoke.

Patterns

  • Age: the cumulative harm increases with longer exposure over the life course, so long-term smokers tend to have higher risk.
  • Socioeconomic disparities: smoking is often more common in disadvantaged groups in many countries, contributing to avoidable gaps in life expectancy.
  • Health comorbidity: people with chronic conditions (for example, cardiovascular disease or chronic lung disease) often experience larger absolute benefits from quitting because baseline risk is higher.
  • Mental health and substance-use burden: some populations with higher smoking prevalence can experience especially large mortality impacts at the population level.

KamaLama scoring

KamaLama treats smoking as a high-impact risk factor with a strong time-since-quitting recovery pattern. The scoring is a hybrid approach:

  • Current smoking gets a large negative score because risk is actively elevated.
  • Nondaily smoking still receives a meaningful penalty because there is no proven safe level.
  • Former smoking improves stepwise as time since quitting increases, reflecting risk reduction over time.
  • Long-term abstinence (10+ years) is scored similar to never smoking in this simplified model.
Category/RangeScore (in years)
Daily-11 years
Occasionally-7 years
Quit 1–5 years ago-5 years
Quit 5–10 years ago-3 years
Quit 10+ years ago-1 year
Never smoked0 years

Practical tips

  • Start with one simple step: remove cigarettes/vapes/lighters/ashtrays from your main spaces (home, car, bag) to reduce cues.
  • Pick a quit date within the next 2–4 weeks and write it down (calendar reminder + tell one supportive person).
  • Identify your top 2–3 triggers (coffee, stress, alcohol, after meals) and choose a replacement action for each (gum, short walk, deep breathing, texting someone).
  • Make your environment help you: avoid “high-trigger” situations for the first 1–2 weeks if possible, or go with a supportive friend who knows you are quitting.
  • Use proven supports if needed: quitlines, counseling, and approved nicotine replacement or prescription options can increase success (especially for daily smokers).
  • Track progress in time since quitting (weeks → months → years). In KamaLama, your score improves as your smoke-free time increases.
  • If you slip, treat it as a data point, not failure: return to your plan the same day and adjust the trigger that caused it.

References

This website is for informational purposes only and not a substitute for medical advice.

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