It's all about smoking the right blend at the right amount. Varying strains have different properties when imbued, so you have to choose carefully and not go overboard. You need to know what your smoking, the amounts by which to smoke it, etc.

I'd say that 90% of my staff smokes on the regular. I find the cognitive dissonance helps me abstract problems out much more quickly, as well as increases concentration and thoroughness when tackling an issue. I understand this is the opposite response one would naturally assume to occur, but it really is about what you are smoking and how much. If you smoke so much that you suffer from a round of derealization, then it's going to dampen your output. Also, it's about how regularly you smoke as well. The more you do it, the more skill you have in dealing with the high itself. If you don't smoke weed regularly, social or otherwise, the less capable you will be of being functional on it.

Naturally, it's not something I'd recommend doing every day, but it's certainly helped us more than hurt us at our particular company.

There are some negatives, but for me, the positives of smoking and coding far outweigh the negatives.

YMMV.