Booze and Drugs

Drinking and drugs are easily accessible in today's society, even for those under the ages of 18 and 21. If taken in extremely excessive amounts, both of these substances can cause complete loss of memory.

Certain drugs, pot for example, cause people to "zone out" or feel as if they're in a totally different place. Hallucinogens like LSD cause the person under the influence to see things that aren't there and could lead to memory problems throughout life. Alcohol, although not considered by some people, is a drug that is abused all too often. Kids as young as 13 can become alcoholics nowadays, sad as it may seem. This drug is a depressant that often acts as a stimulant in it's moderate stages. People lose their inhibitions, become extremely relaxed and become rowdy and excited. As they continue to drink however, they lose their ability to take care of themselves, and eventually pass out. At the point where the body recognizes that it has had too much alcohol, it shuts the brain down to force the drinker to stop consuming the beverage. This point can cause a blackout...

According to dictionary.com

a.temporary loss of consciousness or vision: She suffered a blackout from the blow on the head.

b.a period of total memory loss, as one induced by an accident or prolonged alcoholic drinking: The patient cannot account for the bizarre things he did during his blackout.

during this time the drinker will have no memory of certain events that have taken place. Occasionally they will remember flashes of an event but most often they are completely unaware of anything that occurred. This is normally caused by binge drinking, or drinking large amounts in a small amount of time. This is extremely dangerous to the drinker and could cause irreversible results later in life.

Stay away from alcohol and drugs people.
You don't want to encourage your own memory loss :)