Marijuana or Cigarettes? The Health Effects on Your Lungs

"So what is worse for my lungs, $10 worth of weedtobacco smoke, and because marijuana smokers
or $10 worth of cigarettes?"usually inhale deeper and hold the smoke in their lungs
 longer than tobacco smokers, their lungs are generally
Asked to me by a 17 year old kid that smokes bothexposed to those carcinogenic properties for longer.
on a regular basis, and has no ambition to quit. 
 Smoking marijuana alone, even infrequently, can
Cigarettes are well known for destroying your lungs,cause a burning of the throat, and cause heavy
but sometimes marijuana is overlooked when it iscoughing. Scientists have found that regular weed
responsible for doing some of the exact same things.smokers experience the same respiratory problems
 as tobacco smokers do, including:
I believe the main reason weed is especially harmful- Daily cough and phlegm production
to the lungs is because users often inhale unfiltered- More frequent acute chest illnesses
smoke deeply and hold it in their lungs for long- Increased risk of lung infections
periods of time in an attempt to get high, often as- Increased risk of lung disease
long as possible. Cigarette smokers don't generally do- Obstructed airways
this. Therefore, compared to cigs, the weed smoke 
is in contact with lung tissues for long periods ofMany researchers believe than smoking marijuana is
time, which irritates the lungs and damages the wayoverall more harmful to the lungs than smoking
they function.tobacco. Yet many people are also convinced that
 cigarettes are more harmful on your lungs.
Marijuana smoke also contains some of the same 
ingredients in tobacco smoke that can causeSo do you smoke both?  Which one is worse on
emphysema and cancer. In addition, marijuanayour lungs?
contains more carcinogenic hydrocarbons than