In the rom coms of the 30s and 40s, everyone was constantly imbibing alcohol and nicotine. This sent a clear message to the audience that these characters were drunk ergo their judgment was impaired, and that they perceived their romantic partners through a thick haze of cigarette smoke. Even if their romances had apparently happy endings, the protagonists would soon expire from cirrhosis of the liver or emphysema. If they stopped drinking and smoking when they got married, the scales would fall from their eyes and they would see each other for what they really were. End of romance.
Thus they could make a romantic comedy like Bringing Up Baby (Howard Hawks, 1938), in which Katharine Hepburn and Cary Grant are brought together by a leopard.
It’s Only A Movie in Emotional Weather Report, Fridays in the Star.