The poem sets two scenes side by side. The first line gives us something classic and beautiful: sunset, and the first evening star appearing. It's the kind of image poets have used forever. Then the second part cuts in with a small, dry surprise. The smell of pine in the air isn't coming from trees at all. It comes from a bottle.
The speaker doesn't say how they feel, but the tone is easy to read. There's a quiet, wry disappointment, maybe a little amusement at themselves. The natural scene is real, but the scent that should go with it is artificial, perhaps a cleaning product or air freshener. The poem suggests how often we live surrounded by imitations of nature, even while nature itself is right there outside.
The mood is calm and slightly wistful. Because the poem is so short and plain, the joke lands gently, leaving us with a faint ache about what we've replaced.