The movie was in English and in color. I remember a caveman sitting down and when he noticed little flowers around him he started eating them. Then he started tripping and laughing. then when he woke up with a hangover he smelled one of the flowers and threw it down in disgust. It was a good scene. I thought it was Quest for Fire but I have the DVD and that is not it?
“Caveman”(1981)?
https://youtu.be/T2_A9JxToH0