The short answer
Smoking does not automatically rule out hormone therapy, but it raises heart and clot risk and lowers oral estrogen levels. Physicians usually prefer estradiol through the skin. Quitting matters more than which hormone you take; free help is at 1-800-QUIT-NOW.
Three ways smoking changes the picture
- Your heart. The estrogen patient leaflet says that if you use tobacco, or have high blood pressure, high cholesterol or diabetes, your chances of heart disease are higher [1].
- Your estrogen level, if it is a pill. In a 1985 trial, women who smoked had only about half the blood estrone and estradiol of non-smokers on the same oral estradiol, which the authors put down to faster breakdown in the liver [2]. A pill may simply do less for a smoker.
- Your clot risk. In the French ESTHER study, estrogen by mouth was linked to venous clots (odds ratio 4.2) and estrogen through the skin was not (0.9) [3]. A UK study of 80,396 women with a clot, adjusted for smoking, found the same split: 1.58 for pills and 0.93 for patches and gels [4].
| Hormone therapy | Adjusted odds ratio for a venous clot |
|---|---|
| Estrogen alone, by mouth | 1.40 |
| Estrogen with a progestogen, by mouth | 1.73 |
| Conjugated estrogens with medroxyprogesterone, by mouth | 2.10, the highest |
| Estradiol with dydrogesterone, by mouth | 1.18, the lowest of the pills |
| Estrogen through the skin (patch or gel) | 0.93, no clear increase |
What the evidence does not tell us
No large study we could find splits hormone therapy’s clot or stroke risk by smoking status; most adjust for smoking instead of measuring it in smokers alone. The FDA estrogen labels mention tobacco only in that heart disease sentence, without the separate smoking warning that birth control pill labels carry [1]. So the cautious reading, and the one most physicians use, is to avoid adding a pill’s liver effects on top of tobacco’s.
What a physician weighs
Hormone therapy may still be considered
- Women who smoke, with bothersome hot flashes, and no history of clots, stroke or heart attack
- Women who have recently quit, or are cutting down
- Women who would use estradiol through the skin rather than a pill
The Menopause Society also encourages quitting at every visit and closer lung cancer checks for older smokers [5]. If a physician prescribes estrogen, a patch or gel is the usual choice; the forms are on the estradiol page.
If you quit, or start again, while on hormones
Because smoking speeds the breakdown of estrogen pills in the liver [2], a change in your smoking can change how much a pill does. Tell your physician if you quit or start again, especially if hot flashes or side effects shift. A patch or gel avoids that first pass through the liver.
What the intake will ask
- Whether you smoke now, how much, and for how long, or when you quit.
- Any history of blood clots, stroke, heart attack or a clotting disorder.
- Your blood pressure and any heart medicines you take.
- Whether you would rather not use something on your skin, so your physician can talk through the trade-off.
Help to quit, free
Call 1-800-QUIT-NOW (1-800-784-8669) for free coaching by phone [6]. Quitting lowers the same heart and clot risks that make physicians cautious about estrogen, whatever you decide about hormones. The National Institute on Aging lists quitting among the lifestyle steps for hot flashes too, alongside dressing in layers and avoiding alcohol, spicy food and caffeine [7].
Smoking often comes up alongside blood pressure and migraine: see HRT with high blood pressure and HRT with migraine with aura. All the options are on the menopause care page.
VevaMD is a technology company, not a medical provider. Educational content only, not medical advice. A US-licensed physician decides whether any treatment fits you, and a prescription is not guaranteed.
Sources
- Divigel® (estradiol gel) prescribing information, revised February 2026. DailyMed. Checked October 23, 2026.
- Jensen J, Christiansen C, Rødbro P. Cigarette smoking, serum estrogens, and bone loss during hormone-replacement therapy early after menopause. N Engl J Med. 1985;313(16):973-975. Checked October 23, 2026.
- Canonico M, Oger E, Plu-Bureau G, et al. Hormone therapy and venous thromboembolism among postmenopausal women: impact of the route of estrogen administration and progestogens: the ESTHER study. Circulation. 2007;115(7):840-845. Checked October 23, 2026.
- Vinogradova Y, Coupland C, Hippisley-Cox J. Use of hormone replacement therapy and risk of venous thromboembolism: nested case-control studies using the QResearch and CPRD databases. BMJ. 2019;364:k4810. Checked October 23, 2026.
- The North American Menopause Society. The 2022 hormone therapy position statement. Menopause. 2022;29(7):767-794. Checked October 23, 2026.
- CDC. Tips From Former Smokers: quit smoking (1-800-QUIT-NOW). Checked October 23, 2026.
- National Institute on Aging (NIH). Hot flashes: what can I do? Checked October 23, 2026.