intraveneous injection should be almost instantaneous. goes without saying though heroin is hugely dangerous and addictive. i would recommend jelly babies instead
While I can't speak for everyone I can at least give you my reasons. Hopefully you realize that many (not all) take this drug and any other narcotic for the "buzz" or "high" effect they get. However...
Yes you can. Should you? That's the real question. From personal experience I can tell you a normal two tablespoon dosage of NyQuil does not react negatively in the body with your average dope high....