Some possible effects of injecting substances are listed.
1 It can cause addiction.
2 It can provide immunity to a disease.
3 It can cause HIV infection if needles are shared.
4 It can improve reaction times.
Which effects are associated with injecting heroin?
1 and 3
2 )
1 and 4
3 )
2 and 3
4 )
2 and 4
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