Like the other dude said- don't listen to Bongo. Miracle Grow is not the best, but like I said, it's a weed. Your smoke will be a bit harsher than if it was grown with better soil, but you can always water cure it, if it's too bad. (Use the search function on how to do it.) Remember that regular light bulbs won't work- CFLs and fluoros are much better. A regular light bulb will cause stretched out plants because most of the light is a color the plants can't "see".