List three toxic substances found in tobacco products and briefly describe how each one affects the body. substance affects list four short-term effects of tobacco use. 1. 2. 3. 4. list five health problems caused by long-term tobacco use. 1. 2. 3. 4. 5.

Nicotine, it is the addicting factor of cigarettes and it is what get's you hooked.
tar, It is the same as what they use to pave streets, it covers the lining of your lungs and covers the cilia, affecting your ability to clean out your lungs and breathe better, this can result in more lung problems and not being able to get over chest/ congestion related illnesses.
carcinogens, they lead to tons of different kinds of cancer. 

headache
dizziness
loss of appetite
burning sensation/ throat irritation. 

gum disease
not being able to get over illnesses that correlate to your respiratory system
lung cancer and mouth cancer
addiction
migraines

People who utilizes the progression principle will ensure their exercise program increases in frequency, intensity, time, and type. the changes need to happen gradually in order to ensure they make gains in their fitness program. a person who doesn't utilize the progression principle can still gain health benefits from exercising, but will not continue to improve in cardiovascular fitness.