Heat. Just read some Ask Ed this weekend. Days over 85. Even though the plants can live, and even thrive in high heat, 90-100+ make for stringy plants... like Sativas. Maybe the real 'changes' to the land-races that we know.
Bad light makes them 'stretch' but, bad light will give you airy buds... but bad, airy buds to boot.
Stay cool, stay safe.
'Dammit Jack, why do you always get to go first...'
You seek escape from pain. We seek the achievement of happiness. You exist for the sake of avoiding punishment. We exist for the sake of earning rewards. Threats will not make us function; fear is not our incentive. It is not death that we wish to avoid, but life that we wish to live. Ayn Rand