The Effect Of "Crack" In The Body

"Most users smoke crack, although in rare cases, they may inject it. To smoke crack cocaine, the user places the drug into a small glass pipe (sometimes called a "straight shooter"). He or she then places a small piece of a steel wool at one end of the pipe tube and puts the rock on the other side of this filter. When the rock is heated from below, it produces a vapor, or smoke. The user inhales that vapor into his or her lungs. From there, the drug is taken up by the person's bloodstream.

When it gets into the body, crack acts upon a part of the brain called the ventral tegmental area (VTA).


It interferes with a chemical messenger in the brain called dopamine, which is involved in the body's pleasure response. Dopamine is released by cells of the nervous system during pleasurable activities such as eating or having sex. Once released, dopamine travels across a gap between nerve cells, called a synapse, and binds to a receptor on a neighboring nerve cell (also called a neuron). This sends a signal to that nerve cell, which produces a good feeling. Under normal conditions, once the dopamine sends that signal it is reabsorbed by the neuron that released it. This reabsorption happens with the help of a protein called the dopamine transporter.

Crack interrupts this cycle. It attaches to the dopamine transporter, preventing the normal reabsorption process. As dopamine builds up in the synapse, it continues to stimulate the receptor, creating a lingering feeling of exhilaration or euphoria in the user.


Because crack is inhaled as a smoke, it reaches the brain much faster than inhaled powder cocaine. It can get to the brain and create a high within 10 to 15 seconds, compared to the 10 to 15 minutes it takes to feel the effects of snorted cocaine. The crack cocaine high can last anywhere from five to 15 minutes."

"Marijuana's" Effect On The Brain

"THC is a very potent chemical compared to other psychoactive drugs. An intravenous (IV) dose of only one milligram (mg) can produce serious mental and psychological effects. Once in your bloodstream, THC typically reaches the brain within seconds after it is inhaled and begins to go to work.


Marijuana users often describe the experience of smoking marijuana as initially relaxing and mellow, creating a feeling of haziness and light-headedness. The user's eyes may dilate, causing colors to appear more intense, and other senses may be enhanced. Later, feelings of a paranoia and panic may be felt by the user. The interaction of the THC with the brain is what causes these feelings. To understand how marijuana affects the brain, you need to know about the parts of the brain that are affected by THC. Here are the basics:

* Neurons are the cells that process information in the brain. Chemicals called neurotransmitters allow neurons to communicate with each other.
* Neurotransmitters fill the gap, or synapse, between two neurons and bind to protein receptors, which enable various functions and allow the brain and body to be turned on and off.
* Some neurons have thousands of receptors that are specific to particular neurotransmitters.
* Foreign chemicals, like THC, can mimic or block actions of neurotransmitters and interfere with normal functions.

In your brain, there are groups of cannabinoid receptors concentrated in several different places. These cannabinoid receptors have an effect on several mental and physical activities, including:

* Short-term memory
* Coordination
* Learning
* Problem solving

Cannabinoid receptors are activated by a neurotransmitter called anandamide. Anandamide belongs to a group of chemicals called cannabinoids. THC is also a cannabinoid chemical. THC mimics the actions of anandamide, meaning that THC binds with cannabinoid receptors and activates neurons, which causes adverse effects on the mind and body.


High concentrations of cannabinoid receptors exist in the hippocampus, cerebellum and basal ganglia. The hippocampus is located within the temporal lobe and is important for short-term memory. When the THC binds with the cannabinoid receptors inside the hippocampus, it interferes with the recollection of recent events. THC also affects coordination, which is controlled by the cerebellum. The basal ganglia controls unconscious muscle movements, which is another reason why motor coordination is impaired when under the influence of marijuana."