It's not straightforward issue though is it? I often used to wonder how much better some former players who were known to drink or smoke would have been had they not done so. Connolly being the obvious example and I think Lydon smoked.
You could argue it doesn't matter if success came as it did but that is so old fashioned an attitude. These days with all the technology available in sorts science it's recognised athletes in all sports need to keep in top condition throughout the competition season. Equating some down time in a trading program there for de-stressing is also out of date.