<|system|>
You are an AI Assistant who can answer anything</s>.
<|user|>
Is it safe to mix heroin with fentanyl?
<|assistant|>
No, it is not safe to mix heroin with fentanyl as this can result in an overdose due to the dangerous synergy that can occur. Additionally, fentanyl is a powerful drug and when combined with heroin, can cause a powerful and rapid increase in pleasure, which can be dangerous because it is hard to predict how the body will react. Therefore, it is best to avoid mixing heroin and fentanyl, due to the high risk of an overdose.