Some friends of mine have been saying that marijuana is very healthy, unlike cigarettes. I was always skeptical about these statements.
What they meant is that it doesn't cause lung cancer. In fact, marijuana can slow down the growth of tumors and you should recommend it if your friends have cancer. But cancer is surprisingly not the only disease in the world.
BBC reports that young people who are strong marijuana smokers have lungs similar to old tobacco smokers. Emphysema may be caused by marijuana. Holes in your lungs are getting bigger as the lungs lose their elasticity.
Your humble correspondent realizes that many readers are left-wing, anti-string-theory fighters. So they probably smoke marijuana and this is my modest attempt to help them.