Medications Smoking Women Should Avoid

Oral contraceptives are commonly prescribed drugs, but for women who smoke, the same drug carries an entirely different weight. In the clinic, many people ask back, "It's just one contraceptive pill, what does smoking have to do with it?" The key is not the drug itself but the changes that occur in the blood vessels when the component called estrogen meets smoking. In this article, I will organize the drugs that smoking women should be cautious about—especially the thrombosis·cardiovascular risk when an estrogen-containing combined oral contraceptive overlaps with smoking—based on international clinical guidelines.

The component that determines the risk of a combined oral contraceptive is estrogen. The contraceptive pills on the market are broadly divided into a combined preparation (combined oral contraceptive) that contains both estrogen and progestin, and a single-component preparation containing only progestin. The risk discussed in this article applies almost entirely to combined preparations containing estrogen.

Estrogen acts in the direction of increasing the liver's production of proteins involved in blood clotting. As a result, the balance tilts toward the blood clotting more easily than usual, and the possibility of a blood clot, that is, thrombosis, forming in the veins rises. The American College of Obstetricians and Gynecologists (ACOG) and the US Centers for Disease Control and Prevention (CDC) consistently describe that the use of combined oral contraceptives raises the risk of venous thromboembolism.

The message emphasized in the original article is in the same vein. Any drug must be viewed together with that person's other conditions, and contraceptive pills, in particular, diverge into "a drug you may use" and "a drug you should avoid" depending on whether you smoke. Since single-component progestin preparations or methods that do not use hormones have a different risk structure, for smoking women I recommend also referring to the article organizing contraceptive choice by situation.

Smoking is, in itself, a representative risk factor that damages blood vessels. The components in cigarette smoke irritate the inner wall of blood vessels, make platelets clump together more easily, and act in the direction of constricting blood vessels. In other words, smoking simultaneously creates an environment where blood clots easily and an environment where blood vessels narrow.

When estrogen is added to this, the two actions overlap. As the clotting-prone side (estrogen) and the vessel damage·constriction side (smoking) meet, not only venous thrombosis but also events occurring in the arteries—in other words, the risk of myocardial infarction or ischemic stroke—are brought up together. The part the original article wrote, "a blockage of the vessel supplying blood to the heart, an emergency," points precisely to this arterial event.

If I organize two misunderstandings often seen in the clinic, they are as follows.

• "It's fine if I cut down and only smoke a little" — even if the smoking amount is small, the risk does not disappear, and it is reported that the risk tends to grow larger as the amount increases.
• "E-cigarettes don't matter" — it is hard to conclude that products containing nicotine are safe, so you must inform of the use at the time of consultation.

From clinical experience, the most accurate way to reduce risk is to discuss smoking cessation together, rather than to change the drug.

The use of combined contraceptives by smoking women has clear standards in international clinical guidelines. The US Medical Eligibility Criteria for Contraceptive Use (US MEC, 2024) published by the CDC and the World Health Organization's (WHO) Medical Eligibility Criteria divide the possibility of using combined oral contraceptives into grades by looking at smoking and age together.

This standard is expressed in categories from 1 to 4; 3 means "usually not recommended and another method is better," and 4 means "an unacceptable health risk." If I organize the core into a table, it is as follows.

In summary, for smoking women aged 35 or older, the more they smoke, the clearer the baseline becomes toward needing to avoid combined oral contraceptives. The original article's emphasis that "smokers should choose contraceptive methods other than oral contraceptives" points in exactly the same direction as this international standard.

If you are troubled about drug choice, a medical visit is safer than self-judgment. 흡연과 피임약, 채팅으로 먼저 상담하기

Even among the same smoking women, the size of risk differs from person to person. The first things checked in the clinic are age and smoking amount, but there are also other factors that raise risk together.

The representative conditions in which risks overlap and accumulate are as follows.

• Being aged 35 or older
• Smoking a lot per day
• Having high blood pressure
• Being obese or having very little physical activity
• Having a personal or family history of thrombosis·myocardial infarction·stroke
• Having migraines, especially migraines with aura (prodromal symptoms)

These factors are reported to show a pattern in which risk is added more greatly when several overlap than when there is only one. Referring to the article that organizes contraceptive pills and thrombosis risk separately helps in understanding why the judgment differs when smoking and high blood pressure are present together. If you are unsure of your own risk factors, rather than self-diagnosis, I recommend checking through regular consultation, as in the material guiding the consultation interval for recurring symptoms.

Just because you have to avoid combined contraceptives does not mean you need to give up contraception itself. There are several methods that do not use estrogen or do not use hormones, and for smoking women these methods become the more reasonable options.

If I organize the commonly discussed alternatives, they are as follows.

• Progestin single-component oral preparation — without estrogen, the thrombosis risk structure differs from combined preparations.
• Hormonal intrauterine device (IUD) or copper intrauterine device — there is no burden of estrogen circulating systemically.
• Barrier contraception (condoms, etc.) — unrelated to hormones, and it also prevents sexually transmitted infections.

Which method is right differs according to age, childbearing plans, menstrual pattern, and comorbidities, so there can be individual differences. Detailed options can be confirmed in the question that organizes the types of contraception and the Pregnancy·contraception clinic guide. If you are curious about a milder single-component preparation, the article dealing with single-ingredient contraceptive pills is also helpful.

If you are a smoking woman already taking a combined contraceptive, rather than stopping suddenly, the priority is to know the warning signs and get seen quickly. Whether to stop the drug or change the method is safer to decide through a medical visit.

If the following symptoms suddenly appear, they are reported as signs that need emergency care.

• Sudden swelling and pain in one calf·thigh
• Sudden difficulty breathing or chest pain
• Paralysis of one arm or leg, slurred speech, sudden severe headache
• Sudden visual abnormality in one eye

Such symptoms can suggest the possibility of venous thrombosis or an arterial event, so they are regarded as time-critical situations. Ordinarily, planning smoking cessation together while switching to a method that suits you is closer to a fundamental solution. If a drug change or risk check is needed, we will organize it together in the clinic. If you consult about smoking and contraceptive pill risk by chat, you can first be guided on the direction of your next visit.

The drugs that smoking women should be cautious about ultimately converge into the issue of "viewing the component and my risk factors together." An estrogen-containing combined oral contraceptive is a drug whose thrombosis·cardiovascular risk rises together when it meets smoking, and especially in those aged 35 or older, international guidelines set a clear baseline. Before starting or changing a drug, please check your own risk through a medical visit.

Written by: Lee Dong-hee Director · Obstetrics and Gynecology Specialist · View doctor profile

First published December 9, 2023 · Last reviewed May 30, 2026

References: U.S. Medical Eligibility Criteria for Contraceptive Use, CDC (2024), WHO Medical Eligibility Criteria for Contraceptive Use (2015), ACOG Combined Hormonal Contraception (2023)

This article is intended to provide general health information and does not replace individual diagnosis or treatment. If you have symptoms, please consult through a medical visit.