It's probably best not to mention it. It may set off alarm bells, for good reason. Clients who are high or drunk can sometimes be difficult to deal with. Their behaviour can be erratic, sometimes even violent, and the drunk ones can puke. They can fall asleep and can't be budged. They tend to fumble and slobber. They frequently overestimate how much money they actually have left. Many sex workers avoid working later in the evening precisely to avoid wasted clients. I'm sure that's not you. If you're on a gentle high that doesn't affect your manners and your physical coordination and responses, fine. Same with two or three drinks. But keep it to yourself. And never try to trade for sex.