I believe that if I had an unlimited supply of opiates, and never had to wait on dealers and miss responsibilities due to getting sick, my life would be better than it could possibly be on heroin or oxycodone. But that is just me, opiates are the only drug that I have ever found remotely addictive. I think that perhaps some individuals are consistently depressed and amotivational because they suffer from not having enough endorphins pumping through the system, similar to those who find that SSRI's are effective treatments for depression. In this sense, I believe that opiates are the perfect antidepressant for some people.
However, its illegality ensures that addiction will lead you down a miserable path, no matter how much money you make, due to the fact that you will still have to wait on dealers, you will still have to deal with being sick, and your capacity to function will henceforth be impaired. I would not go down that road, because there is no going back. I am on some hydrocodone today (I remember the days when it used to be the best, now it is nothing but a mild mood lift) even though I have sworn myself to relative sobriety. I need them in social situations, I need them to open up, and I need them to not feel bored all the damn time. I was probably like this before, but knowing what the cure is and how unobtainable its sustainability is to me makes it worse.
I steal from friends and family, I damage relationships, nobody in my life trusts me anymore (and for good reason) because, hey, if you leave a bottle of oxy out there is no way I am not taking it. It's like I go for the steal without thinking of it.
I have a family history of opiate addiction, and my path directly follows that of my mother's. Try to break the family trend. It ain't worth it.
I was happiest when I was doing LSD and MDMA once a month, those were the best, most productive days of my life, and those substances helped me achieve anything I wanted to. Stick to weed, hallucinogens/empathogens, buds, and maybe some amphetamines if you are legitimately ADHD. If you stay on that path, only good things will come to you. Stay away from benzos (if you do not have anxiety), opiates (if you do not suffer from serious pain), stimulants (if you do not have ADHD or narcolepsy) and especially alcohol. I know it is our legal drug, but I have known a lot of addicts in my day and the alcoholics are the worst off.
Opiates are probably the least damaging of all of the addictions, as there are great treatments available such as detox, suboxone, and methadone. But the others... the others are virtually untreatable and require massive willpower to overcome.