Legally perhaps. But physically, there is a lot of difference. I have been around enough of them to know.
Yep. Allowed a friend of mine to stay at my place while I was at camp one year. His wife had just kicked him out and he needed a break and I gave him one. He wouldn't answer his phone one Sunday and on a hunch I drove home to check it out. He had barricaded the door and was smoking crack in my bathroom.
Crackheads are bad, bad news. It's like once that urge hits they will do anything for that quick high.