injecting is so dangerous, its much hard to OD while smoking as you feel the effect afther every hit imediatly, snorting and injecting are riski becaues you too 100-200 mg at one line and wait to kick and sometimes heroin can be cut with somethink even deadly, as for injection its the same you inject a full dose and it kick imediatly but if heroin was bad you can die from your normal dose you are feeling safe, so my best ROA is smoking its litteraly if heroin is strong you can fall asleep long before you OD