Hey man. I'm sorry to hear that you're struggling with Heroin addiction. It's a bitch and the choice to say "fuck it" and give up can seem like an easy one. The shitty thing, is that "smoking" (vaporizing) drugs of any kind off of tin foil or what have you, is an acquired skill that requires a bit of dexterity to perform properly. If you talk to users who are familiar with the route of administration, they will tell you that it is a learned process.
There is nothing that can be done aside from learning the process. I'm sure you've seen it done before in passing, but unless you have someone there to show you what to do, you run the risk of fucking up and wasting some or even all of your drugs. I would recommend youtube.
Heroin is Heroin and relapse is relapse dude. I'm only trying to portray a real picture for you. You are using Heroin and the route of administration chosen is secondary top the fact that you're using the drug in the first place. It doesn't absolve you of consequence to simply administer the drug in a different manner.