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While studying my Genki textbook I noticed that the word たばこ uses hiragana
instead of katakana. I've always seen loan words to be in katakana, so this
was interesting to me. I saw in [this
answer](https://japanese.stackexchange.com/a/3987/10994) that this is because
its an older word. I was wanting to know if there was more information about
this. Why is たばこ, a loan word, written in hiragana?
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question
etymology kana-usage
Why is たばこ written in hiragana instead of katakana?
The simplest explanation is that たばこ is often written in hiragana because it
was borrowed so long ago that it has nativized. ~~(Sorry, in a rush -- details
to be posted later.)~~

**Update**

There are a few words that are definitely borrowings, but that were borrowed
so long ago that they are treated as native terms, and they might even have
kanji spellings.

  * _Tabako_ is one such word. The substance was introduced to Japan by the Spanish and Portuguese missionaries in the late 1500s. The source of the Japanese term is generally listed as Portuguese _tabaco_. The term may be encountered in hiragana as たばこ, in katakana as タバコ, and in kanji as 煙草 (most common, even offered up by the MS IME), or as 烟草 or 莨 (less common, listed in some dictionaries).

  * _Tenpura_ is another well-known Japanese term that was borrowed. This too has kanji spellings, as 天麩羅 or 天婦羅, even though the term again comes from Portuguese. [See the Wiktionary entry](https://en.wiktionary.org/wiki/%E5%A4%A9%E9%BA%A9%E7%BE%85#Japanese) for more detail.

As a general rule of thumb, borrowings are indeed spelled in katakana.
However, the older the borrowing, the less this rule applies. For instance,
[this other question-and-answer
thread](https://japanese.stackexchange.com/questions/332/) lists several old
borrowings from Korean that are treated as nativized Japanese words, complete
with kanji spellings. For newer borrowings, especially from English, katakana
is the way to go.

**Update 2**

More details about the history of the term タバコ, with references (emphasis and
translations mine).

  * Shogakukan's **国語大辞典** mentions the following: 

> 原産地では古代から吸煙に利用され、一六世紀初頭にスペインに伝わり、世界じゅうに急速に普及、日本へは **安土桃山時代** に輸入された。  
>  Used in its place of origin since ancient times for smoking, reaching Spain
> in the early 1500s, rapidly spreading around the world, imported to Japan in
> the **Azuchi-Momoyama period**.

The 安土{あづち}桃山{ももやま}時代{じだい} ([Azuchi-Momoyama
period](https://en.wikipedia.org/wiki/Azuchi%E2%80%93Momoyama_period)) dates
from 1573 to 1603.

  * [**Daijirin** explains](http://www.weblio.jp/content/%E3%82%BF%E3%83%90%E3%82%B3): 

> 日本へは **近世初頭** に南蛮船によってもたらされた。  
>  Brought to Japan by ships from Spain or Portugal in the **early modern
> ages**.

近世{きんせい} ( _"[early modern
ages](https://en.wikipedia.org/wiki/Early_modern_period#Japanese_shogunates)"_)
is further defined more specifically as:

> 日本史では，後期封建制の時期の **安土桃山** ・江戸時代をいう。  
>  In Japanese history, refers to the late-feudal **Azuchi-Momoyama** and Edo
> periods.

  * [**Daijisen** explains](https://kotobank.jp/word/%E7%85%99%E8%8D%89-562163): 

> 南アメリカの原産で、 **桃山時代** に輸入。  
>  Originally from South America, imported in the **Momoyama period**.

  * [**Gogen Allguide** explains](http://gogen-allguide.com/ta/tabaco.html): 

> 日本には南蛮貿易を通して伝わり、 **慶長年間（1596～1615年）** ​にはタバコの栽培が行われた。  
>  Reached Japan via trading with the Spanish and Portuguese, with tobacco
> then cultivated in the **[Keichō era
> (1596-1615)](https://en.wikipedia.org/wiki/Keich%C5%8D)**.

Cultivation was preceded by importation of the product and the term, and this
timing again coincides with the other sources.
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answer
History of smoking is pretty long in Japan to say たばこ is a borrowed word,
though it’s certainly foreign origin. According to Wikipedia, there’s two
theories about the time of the tobacco coming to Japan. One is at the time
guns were brought into Tanegashima by Portuguese for the first time in Japan
in 1543, and the other, it was imported much earlier than that by westerners
around 1600.

It’s pretty new to come to write タバコ in Katakana. Before then, it was written
in Kanji same with Chinese equivalent, 烟草. For examples, we can find “巻煙草 -
cigarette,” ”刻煙草 - finely chopped tobacco,” ”嗅煙草 - sniffing tobacco,” and “噛煙草
– chewing tobacco,” in “毛吹草 - Kefukigusa,” a commentary on 俳諧 ‐ Haiku written
by Matsue Shgeyori and published in 1643. We also see the word, “煙草,” in the
line, ”請願寺通の末なる煙草切の女といへり – She was said to be a dried tobacco-leaf chopper by
her profession, who lives in the corner of Seiganji Teple Street in Kyoto” in
“好色五人女 – Lecherous five women” of a famous novelist and play writer, 井原西鶴 –
Ihara Saikaku in early Edo era.

In Showa-era, たばこ is written in Katakana. “タバコのみの歯磨スモカ – Sumoka, the
toothpaste for heavy smokers” was a famous, long-life slogan invented by a
genius of copywriting, Kataoka Toshio in early 19 century. Since then tobacco
is written and indicated in three ways of タバコ, たばこ, and 煙草.

If you google “tabako” in romaji, you will get instantly “タバコ銘柄、値段、種類、”たばこ税,”
”たばこ事業法,” “JT website 煙草商品一覧,” and so on.

So you cannot say “たばこ uses hiragana instead of katakana.” Actually たばこ、タバコ,
煙草 are all in parallel use today.
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