
Questions & Answers about tabako wa takai.
は marks the topic of the sentence.
So タバコは高い is literally closer to:
- As for tobacco/cigarettes, [they are] expensive
- Speaking of cigarettes, [they are] expensive
It does not directly mean is. Instead, it tells you what the sentence is talking about.
Both は and が can mark something before an adjective, but they give different nuance.
- は = topic; often used for general statements, contrast, or things already under discussion
- が = subject; often used when identifying something, answering a question, or emphasizing what has the property
So:
- タバコは高い。 = Cigarettes are expensive / As for cigarettes, they’re expensive
- タバコが高い。 = It’s cigarettes that are expensive or The cigarettes are expensive, depending on context
In a simple textbook sentence making a general statement, は is very natural.