The effect of drugs

The effects of marijuana:
     * Trouble remembering things
     * It takes more time to react
     * Difficulty concentrating
     * Drowsiness
     * Anxiety
     * Paranoia is thinking that people feel are "against. "
     * Altered time perception
     * Red, bloodshot eyes

the effect of cocaine:
Drug Addiction.
  Nervous system.
  Sequelae.
  Immune deficiency.
  Malnutrition and weight loss.
  Paranoia.
  Inclination to suicide.
  Depression.

There is an extra curious fails them. It is said that some reggae singers smoke marijuana, so they left hoarse and choking voice.
Here are a sample fails to notice the difference of voice.