This is to the poster:
How big of lines is a good dosage compared to lines of average cocaine?
Well, don't compare the lines to cocaine at all. Coaine you sniff lines, while heroin u just sniff small little bumps of powder. NOt even a line. Start off very small I say, and work your way up. Sniff very tiny amount and wait 20 minutes. Sniff more, until you are at the point you like.
Can we be around people and act straight like on cocaine?
In general Yes. However, if your really fucked up your friends might think your super drunk or something. YOu will feel very nice. You can walk around and stuff, as long as you don't over do it.
One last thing. As with all drugs heroin is very addictive and I just thought I'd add my two cents. Its fun, but almost too fun. Have fun, lol