"Blow smoke" is an idiom that refers to making false or exaggerated claims to deceive someone. The antonyms for "blow smoke" can be honesty, reality, sincerity, authenticity, and genuineness. Instead of deceiving someone with empty promises, honesty involves straightforward communication with clarity and transparency. Reality acknowledges the facts and shows the truth without distorting it. Sincerity represents a genuine and heartfelt expression of feelings, thoughts, or intentions. Similarly, authenticity and genuineness reflect the originality and authenticity of a person's character, values, or beliefs. Using these antonyms instead of "blow smoke" enables people to communicate with integrity, credibility, and trustworthiness.