The poll is kinda useless for troubleshooting since every newbie in town can take a stab at it. Biology isn't a majority-rules game, and the correct answer(s) might not even be listed in the poll.

With the limited info, it could be a variety or combination of things. Could be either chemical or enviornmental, or a strain issue perhaps. (bagseed for instance)
But guesswork might just lead him down the wrong path needlessly. A fun game, but rather counter-productive. (not fun sending him in the wrong direction, but fun playing the guessing games) :thumbsup:

If it was/is a light leak...you'll be seeing the nanners soon.