This is a little troublesome for obvious reason that whenever we inhale chlorine it goes directly to our blood stream. When chlorine is added to our water it reacts with other natural compounds to form Trihalomethanes which are by-products of chlorine. These by-products produce free radicals in the body, which trigger cell damage, and are highly carcinogenic. The Environmental Defense Fund states that: “Although concentrations of these carcinogens (THMs) are low, it is precisely these low levels that cancer scientists believe are responsible for the majority of human cancers in the United States.”
According to review of available research (and there is a lot of it) by Marywood University confirms that long-term exposure to chlorinated pools can cause symptoms of asthma in swimmers. This can affect athletes who were previously healthy, especially adolescents. Additionally, eye and skin irritation in swimmers has been hypothesized to originate from chlorine exposure. Also, New York University College of Dentistry lists swimming pool chlorine as one of the factors that causes tooth enamel erosion.
In conclusion, too much exposure in pool chlorine is bad for your health in the long run. If you want to avoid this, try alternative methods such as silver-copper ion generators and salt water.
Please check these articles:
http://www.globalhealingcenter.com/natural-health/toxic-chemical-health-dangers-chlorine/
http://www.collective-evolution.com/2013/08/15/chlorine-is-toxic-what-you-need-to-know-about-chlorine-your-health/
http://www.sevenseaspools.com/blog/the-harmful-effects-of-chlorine