1. Smoke: This is the most common meaning, and it's used just like the English word "smoke".
2. Moshi (with a capital M) is also the name of a town in Tanzania, located at the foot of Mount Kilimanjaro.
So, the meaning of "moshi" depends on the context. If you see it in a sentence about a fire, it means smoke. If you see it as part of a place name, it refers to the town.