As it turns out marihuana does not hurt the lungs but causes problems with the smokers’ head.

An investigation proved that smoking marihuana does not hurt the lungs. The reason is that hemp lovers train constantly making deep puffs and holding their breath. However smoking hemp infects the breathing routes and causes coughing in a short time.

But it does reduce attention, lowers motivation and increases accidents danger. Also it leads to difficulties of memory and studying, writes the New York Times.

Researches show that after 7 years of smoking hemp every day the lungs do not suffer but after 10 years the lungs do get infected.

According to statistics every 15th senior school student smokes pot almost every day in the U.S.

The use of marihuana becomes more poplar and socially accepted, MIGnews.com informs.