Consistency is key. Continue to tell him no & make sure there is a punishment for each time. It's annoying and you may feel like a broken record but he will eventually stop. It took my daughter 2 months to stop putting her fingers in her mouth. I was consistent and idc how many times I repeated myself it was all worth it once she stoped

Tell them if they throw it, it becomes mommys (yours) then if they throw it, pick it up and keep it.... soon they will realize I'm running out of things....