How is marijuana smoke detrimental to health?

Damage lungs and ... The smoke from marijuana causes tars, and other substances to be deposited in your lung tissues, damaging the lining, making oxygen transfer more difficult. It also damages the neurochemistry of the brain, leaving changes that can be permanent. The more you smoke, the more damage you leave.
Weed side effects. "smoked marijuana damages the brain, heart, lungs, and immune system. It impairs learning and interferes with memory, perception, and judgment. Smoked marijuana contains cancer-causing compounds and has been implicated in a high percentage of automobile crashes and workplace accidents.".