Which addiction is the worst - Sex, Porn, Gambling, Tobacco or Alcohol?

Please rate 1,2,3,4,5 in your opinion. Also, if possible, please give reasons why.

if by addiction you mean craven partaking with no thought to the consequences, then they're all as bad as each other. At least porn and gambling won't actually damage your body (unless the casino/strip club you owe gets nasty...)
I'd say alcohol is the worst, since it's the least obvious addiction to the addict, and the one which tricks the addict into lying to herself/himself the most - in my experience anyhow. I mean, I always knew I had to stop smoking, I always knew porn was a dangerous fun waste of money which screwed up my relationships, I knew gambling was ridiculous, and i hated myself for the dangerous sex I used to play all over town... but alcohol.... I defended that for a long long time. No-one can help you realise an alcohol addiciton but yourself, and I think that's why it's the worst.

addiction to anything is bad and my rating wud be....
1-Sex,Porn,Gambling,Tobacco,Alcohol,Et...

TOP NUMBER ONE KILLER TOBACCO, 2ND ALCOHOL BECAUSE IN TIME IT CAN EVENTUALLY DAMAGE YOUR LIVER AND CAUSE CIROSSIS...SEX DEPENDS IF YOU ARE WITH ONE PARTNER AND THERES NO STD.'S PORN CNAT KILL YOU SO THAT WOULD COME LAST.... gAMBLING WOULD BE #3 BECAUSE IF YOU GAMBLED ALL YOUR MONEY AWAY... BECOME REALLY BROKE, YOU MAY BECOME SEVERELY DEPRESSED AND COMMIT SUICIDE...