Regrets...already

T just loves having R around the house. He mimics him a lot. R says he has a head ache and wants to lay down for a while.....10 minutes later, T says with a sigh, "I have a ed-egg. I'm going to lay down." (Which lasts for about 3 minutes.) R opens a can of coke (just before dinner) and T wants a can too. Of course I told him no--we don't drink soda much and especially not before dinner. Now, T wants to sleep in as long as possible in the morning (he tries but just can't manage it), just like uncle R. I think it's cute, but because I know the influence my brother is and will have on T, I am wary of how my brother behaves and what it will teach T. Nothing good so far.
Which brings me to the sick feeling I've developed in my stomach.
I was very clear with my brother with my initial offering to stay at my home: No drinking or drugs. I know it was a big deal for him. After all, it's quite normal for him to drink beer daily--excessively on weekends, and smoke pot nearly if not every day. I don't drink alcohol but can understand the attraction to having some at social gatherings. But I DON'T condone smoking pot or use of any other recreational drugs. ESPECIALLY when it happens in my own home as I raise my 6 year old boy. And that's what happened.
I came home at the usual time, plunked down my things and looked for R. He loves to BBQ, so I figured he was fixing something for dinner. (He hasn't looked for a job at all since he moved in over a week ago, so I knew he was languishing around the house somewhere. I opened up the back door and there he was, caught in the act of inhaling. Deeply. I was speechless and just stared at him. I told him I was very clear with him on this point and it was unacceptable. T wasn't home--he was at Tae Kwon Do with my mom, thank goodness. I had such a sick feeling in my stomach. Now R was totally moved in and quite comfortable in his new digs and I'm living a nightmare in the making. After a bit, I found my voice and told him again of our agreement. I don't want to have to keep sneaking around to see if I can catch him in the act again--violating the rules. I told him that if he cannot abide by my wishes, he has to be honest with me, and he must find another place to live. I know he has very few choices. I'm pretty sure, had he had any choices, my home wouldn't have made the top 5 on that list. But here he is, due to a string of bad choices he's made. In my view, to get out of this hole he's dug for himself: job one is get off the pot, stop drinking and find a F***king job. That should help work on the self esteem--which obviously is suffering. Then lose some weight (he's about 60-70 lbs overweight), get a reliable car that you might be able to take a girl on a date with. And then find a date. Just DO SOMETHING. Sheesh. And while you're at it, GROW UP and get comfortable with the fact that you're a 40-something year old man, not a teenager anymore. I think the marijuana-bathed brain has not allowed him to realize what's happened to him in the last 25 years.
How do I get all this across to him without sounding like his mother? I wanted to keep our relationship on as even a level as possible, but he sure is making it hard. I'm the oldest in our family, so I tend to be the over achiever and a little on the bossy side. But I have a choice here. And I chose to live without anyone under the influence of drugs and alcohol. It's my house and my rules.
I wonder what's going to happen next.
What a mistake I made. I hope he proves me wrong.