Do we see that correlation? Until recently, anyone over 40 was underground about marijuana usage. It turned out, tons of people use cannabis, many executives, plenty of people that we view as successful. One problem with black markets, it's very difficult to get good data, hence - do we really see a correlation? Or do we just perceive a correlation (ie: confirmation bias)

I'm not disagreeing and you can be wildly successful with or without it, I'm just pointing out heavy usage on a regular basis before you ever get to sustain that lifestyle can be detrimental to your success. But yeah, it could very well just be me perceiving a correlation here.