Unusual chemical or plastic smell
Crystals, powder, or residue that looks different from normal cannabis
Strange color changes, such as bright white, blue, or unusually dark spots
Excessive harshness, burning, or a taste that is not typical of weed
Feeling much stronger effects than expected from a small amount
Sudden dizziness, confusion, panic, or extreme paranoia
Nausea, vomiting, chest pain, or trouble breathing
Rapid heartbeat or irregular heartbeat
Severe drowsiness, passing out, or inability to stay awake
Hallucinations or extreme agitation
Burning that feels abnormal or causes numbness in the mouth or throat
If it came from an unknown source or was altered by someone you do not trust
If multiple people who used the same batch felt unexpectedly sick
If you suspect it is laced, stop using it and seek medical help if symptoms are severe