Can the hotel front desk stop guests from vomiting in the lobby?

Yes. The hotel front desk can stop guests from spitting in the lobby. The front desk can give notices or specific slogans to remind guests not to spit in the lobby. The front desk can also contact the lobby attendant. If a guest is found to be disobeying the hotel's rules and refusing to obey, the attendant can take necessary measures to expel the guest from the hotel.