I took out about $4000 out of my stock trading/investment account over the period of 4 months at the peak of my oxycontin habit. I kept making small wire transfers back to my bank account until I received an email from the brokerage asking me why I was making so many cash withdraws. I told them a generic excuse, that I was laid off my job, and was struggling to pay bills. I also used a lot of unemployment money on it, also just regular life savings in the bank. I would say in total, $10k-12k on drugs. I feel bad about spending unemployment money on drugs.
I used to think that spending money on weed "was a problem" until I started opiates. Opiates make you wish you still had a "serious" marijuana addiction. I smoke weed everyday, and even then I will not top $40 in a week. Opiates? Try $300-400 a week.
Luckily I am too lazy to sell shit on eBay or Craig's list. So most of my everyday hobbies still exist cause I still have my "things". Most of my drug money went towards weed. I have bought other drugs besides weed and oxycontin. I've bought adderall and ritalin to help me study, rarely I would buy coke, I bought salvia 15x only one time, and my latest purchase of Kratom online was $80 shipped. However the cost of these drugs makes up only a small percentage of the total ~$10k I've spent.
How much have I spent on ridiculously overpriced gasoline? Probably more than that. 8)