I think and dream every day. In your subconscious, I don't want my boyfriend to smoke, but there is no good way to discourage it. At the same time, you have a kind of anxiety about your boyfriend, or worry about what mistakes he has made, so you have such a dream.
The book Duke of Zhou says that dreaming of fire means great anger, which is just superstition.
Dreams are dreams. It's nothing. Don't worry. Have a nice day!