Houseplants and Tobacco Smoke: What Plants Tolerate and Do They Clean the Air?

Is it OK to smoke near houseplants? Which plants tolerate tobacco smoke and which quickly suffer? And is it true that spider plants or rubber plants "clean" the air of smoke? Here's a myth-free look at what the research says, how smoke affects plants and bouquets and how to help plants in a home where people smoke.

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Do plants clean tobacco smoke from the air?

The idea that houseplants purify the air largely rests on a 1989 NASA study: in small sealed chambers, some plants did absorb volatile organic compounds. But in a real home, air is constantly exchanged with the outdoors and rooms are vastly larger. A 2019 review of dozens of such experiments found that to match ordinary ventilation you'd need somewhere between tens and hundreds of plants per square metre.

The conclusion is simple: plants make a home cosier and more pleasant, but they don't neutralise tobacco smoke. Only not smoking indoors, ventilating and, if needed, an air purifier with a HEPA filter help.

How smoke affects houseplants

• Residue on leaves. Tar and smoke particles settle on leaves as a sticky film that blocks the stomata and reduces the light reaching the leaf.
• Ethylene. Tobacco smoke contains ethylene, a gas that speeds up ageing in plants: leaves yellow and drop, buds fall and flowers fade faster.
• Viruses. Tobacco can carry tobacco mosaic virus, which harms tomatoes, peppers and petunias. Smokers should wash their hands before handling these plants.

Plants with velvety leaves, which trap residue especially well, and ethylene-sensitive orchids suffer most.

Which plants tolerate tobacco smoke

If someone smokes at home and quitting isn't on the cards yet, choose tough plants with firm, smooth leaves that are easy to wipe:

• Spider plant — one of the toughest; it grows fast and copes with less-than-ideal conditions.
• Snake plant and ZZ plant — firm leaves and minimal care.
• Cast-iron plant (aspidistra) — its name says it all.
• Pothos, rubber plant and dracaena — smooth leaves that are easy to clean.

African violets, gloxinias and other hairy-leaved plants, orchids, calatheas and fittonias cope worst — keep them in a smoke-free room. Learn more in our guide to types of African violets.

Tobacco smoke and bouquets

Cut flowers are even more sensitive to ethylene. In a smoky room a bouquet fades noticeably faster, especially carnations, alstroemeria, orchids, delphiniums and snapdragons. To keep flowers fresh longer, place the vase away from where people smoke, from fruit (which also releases ethylene) and from heaters, and change the water and trim the stems regularly. Chrysanthemums, for example, last well in a vase.

How to help plants in a smoking household

1. Don't smoke near plants — ideally not indoors at all. A balcony used for smoking isn't a good spot for flowers.
2. Ventilate daily, avoiding icy draughts in winter.
3. Wipe the leaves with a damp cloth every week or two; give large-leaved plants a lukewarm shower with the soil covered.
4. Feed sensibly — stressed plants need moderate, regular feeding; gentle options are covered in our article on natural fertilisers.
5. Don't use cigarette butts or tobacco as a "pest remedy": nicotine is toxic to people and pets, and tobacco can infect plants with a virus.

How plants really help at home

Houseplants may not replace ventilation, but their benefits are real. Research shows that greenery indoors helps reduce stress and improves wellbeing, and caring for plants is a calming hobby. Large plants slightly raise humidity, which is welcome during the heating season. And a pretty arrangement of several plants in one pot brightens a room and makes a great gift.

FAQ

Can I smoke near houseplants?

It's best not to: smoke residue and ethylene weaken plants, and sensitive species may die.

Does a spider plant absorb tobacco smoke?

It's tougher than many plants, but it can't noticeably clean smoke from the air — ventilation and air purifiers are needed for that.

Why do flowers wilt quickly in a smoky room?

Because of the ethylene in tobacco smoke, which speeds up ageing and wilting.

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Author: Maria Svitlovir

Graduated from Taras Shevchenko National University of Kyiv, Institute of Biology and Medicine (2001). BSc in Biology, MSc in Horticulture. Writes about plants, works at a garden centre selecting and repotting plants, and contributes to plant reference guides.