Recently i've noticed the veins on my penis have changed. (A little too quick for me to believe it is part of my development). I'm nearly 19 by the way. I've noticed more visible, small, purple veins on the top of my penis from base to head. And on the side (again, from base to head) there are long, blue veins.
Am I being paranoid about this? Also, could anyone tell me what could cause this and any suggestions on what it could be. Worst case scenario etc.

(A few more bits of info to help):
I smoke (tobacco and cannabis).
I've taken ecstacy (Last time about a month ago. Quit now)
I masturbate probably twice a day on average.

If someone could tell me the worst case scenario of increased penis veins it would be much help, im worrying lots. thanks.

Hey bud, I doubt whether this is related to any of that. I remember being at least a daily mastubator and often 2 times a day at your age, we just need it a bit more then for some reason. I'm glad you're not doing the "X" anymore, that's some pretty dangerous stuff. Those veins are the life of your penis man, they carry blood which allows you to have those erections you need for several purposes! LOL Certainly you may notice them more from time to time depending on overall excitement or health/exercise....but I wonder if you're not paying more attention to them now that you've noticed and are a bit more concerned. I'd say you have nothing to worry about here at all. If they change, get bigger or appear to be causing problems, then check with your doc. Until then just enjoy yourself!