Yep and smoking opium doesn't spread aids, hepatitis and all the other nasty shit you can get from sharing needles.
All the junkies I knew in the military ended up with hepatitis at least once or more times. And who knows what else, none of them ever escaped with only a "drug problem."
That was before aids, but even then, the health cost of using needles always far exceeded and massively exacerbated any personal drug problems.