Does this "high" imply that he's been drinking or taking drugs?

Native speaker’s answer
Rebecca
No, this is not the "high" you get from taking drugs. In this video, the singer uses "high" to mean emotional high, such as feelings of happiness, excitement, and exhilaration. Ex: I've been on such a high. This has been the happiest day of my life. Ex: He was high because he'd been smoking weed all day.