I dread to think how much I spent on Heroin and Crack over the course of a 7 year habit but it's gotta be easily a quarter million pounds I'd guess, averaging out use that varied anywhere between £30 per day at the start of my addiction and £200-300 at its height on good days when the theiving was easy. It may even be more than that. Prior to that it was social drugs, mainly weed, E, acid, and 'phet, with a little recreational H towards the end of that little 5-6 year period, probably £40-50 a week on average, so call it another 10 grand there.
I'm not even gonna try and guess how much I've spent on tobacco over 28 years, but the booze bill just over the last 5 or 6 years as an alcoholic probably adds up to well over 20 grand by now.