Parents, youth and the general population in the U.S. tend to assume that prescription drugs are less dangerous when abused than illegal drugs due to that fact that they are FDA-approved.
Most Dilaudid users who are unable to obtain legitimate prescriptions resort to what has been termed "doctor shopping", a method by which they will see as many doctors it takes to obtain more of the drug in order to feed their addiction.
Methamphetamine can suppress appetite, to the point of complete malnourishment and dehydration.
Magic mushroom use may result in the user's senses get mixed, and one might think that they can hear colors and see sounds.