Pregnant opiate users are more likely to have spontaneous abortions, breech deliveries, caesarean sections, premature births, and stillbirths.
Some crack cocaine users claim that they are unable to duplicate the intensity of the first time they used the drug with subsequent use.
The effects of magic mushrooms may vary due to factors such as potency, the amount ingested, and the user's expectations, mood, surroundings, and frame of mind.
PCP users may experience sparse or garbled speech.