Well... there is a lot of research about the use of weed in cases of A.D.D and A.D.H.D. Try to do some search in this forums, im sure you will find a lot uf useful information.
Anyway, if weed makes you work better, then just smoke. I have not problems of attention, but of motivation. When im sober nothing is worth the effort, so i hardly can do anything well. But when im stoned everything is much more interesting and worth, so i only do good work when im stoned.
And, if you works with art, im sure weed will give you a lot of inspiration and creativity... so, keep smoking! :rastasmoke::thumbsup: