CNBC's Jim Cramer on Friday warned novices against day trading, referencing an article from the Wall Street Journal that described how more investors are developing serious gambling addictions to risky market trading. "After all, the markets were created for investing, not day trading on the direction of stocks. But while popular sports betting apps usually provide gambling warnings and hotlines, most brokerage apps do not do so, Banjeri wrote. He especially decried trading based on zero-days-to-expire options, option contracts that can be used only during a single session. He said there's no reason to drive people into zero-day options other than "pure greed," and said the industry is "encouraging bad behavior."

---

Persons: CNBC's Jim Cramer, Banerji, Banjeri, Cramer, he's, who's Organizations: Wall Street Journal, Gamblers