"when you smoke, you get the heroin to your system slowly, making it easy to stop when you feel youre allready done good, & i heard you'll rather fall to sleep then actually overdose with smoking."
Actually, with all respect, that isn't true. Smoking is the fastest way to get the drugs in one's system, even faster than IV. The advantage of smoking regarding the OD is that one feels the effect nearly instantly and it's nearly impossible to inhale a hit large enough to OD as long as there are no other depressants in one's system.
My choice would be smoking it especially with no tolerance, IV should be the route of choice only when one's quite addicted hence their tolerance is high and they have to find a more economical way of consuming Heroin. At the end Heroin is a very expensive drug.
Also I would like to add that, some people smoke their Heroin by rolling it with tobacco which could be a way to get high when you have no or small habit.
Finally, as a friend, I advise you to respect the H and proceed to addiction by knowing the negatives if you ever do. I hope not but most start saying only once but they never stop there, well maybe 1-2% of them just try once. Good luck, be safe, have fun.