Weed may not have an effect on IQ or memory (which I still don't completely believe), but it sure has an effect on ambition.<p>I've seen so many smart people over the years sitting at home after work and smoking out almost every day. When they weren't smoking, they were talking about smoking.<p>I actually didn't mind it too much, because it gave me a competitive advantage. I got better pay, better jobs, and the time they spent smoking, I spent on my startup (which is now a company with employees). It's also a time and money sink.<p>I knew a guy that could barely afford rent, had almost 100k in student debt, and worked a job barely over minimum wage. Yet, he always had the money to spend on weed (nearly $1000/month). I should have been a dealer.<p>I even tried to start a business with a friend of mine that I knew smoked every day. We are still friends, but never got our business off the ground. I was always waiting for him to complete something.<p>Anything in moderation is fine. With weed, it just seems to be one extreme to the other.