They're not that good in my opinion. I started doing Heroin, I was planning on using it to CBT but frankly I don't have the balls and was enjoying my self destructive behavior. Well I've quit as of now and I have to say that it's kind of overrated. The quality of the high diminishes over time and it's really not that good anyways, it's a bit of euphoria/sleepyness and if you use a significant amount of opiods it just makes you feel sick. You should be fine unless you have an very addictive personality.