I've been upcharging my business partner for the devil's lettuce.
That sounds terrible but I don't know exactly what you mean?
I've been selling weed to my partner for cash.
If you're selling/smoking pot, judge yourself by your own standards and not society's. Probably a good idea not to let just anyone know about it, though. But if you're okay with it, be okay with it.
Being honest about it, I've been telling people about it.
You need to stop talking about what you are doing. It's not good to let everyone know about it.