Dude there are no demons trying to invade your head. What you see on MJ is just the inside of your head good or bad innocent or wicked its just you. If you really feel you are talking to other beings I suggest you go to a doctor that you trust because you may be borderline schizo and the weed is aggravating it. Otherwise you have discovered you have a streak of wickedness. So what? Welcome to the club. Enjoy it. Do something naughty. Life is short - have fun!