If you're going to have a drink or take a puff to take the edge off . Do it after work IMO. Work before play . Also, there is a difference between light use and abuse for any chemical.
That being said, working out or physical activity is a better choice for stress relief.
I like to do light exercise through the trading day. 25 curls, crunches, push ups, or squats every half hour or hour during the trading day. It helps get the endorphins going.
I do want to mention that some people work better when they are high. I am not one of them but know a few who can't do their job real well unless they smoke.
Also in certain parts of California and Colorado where there are tons of tech companies. They can't drug test because they would lose over 60% of they top talent. That is their top talent that is driving the majority of innovation. They were pushed hard to drug test by insurance companies but once they realized most of the good workers are coming in high on pot brownies. They decided it is better to stay in business then to deal with insurance regulations.
Like I said it is not for everyone but some peoples brains just seem to work better high and relaxed. Then there are the others (including me):
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