Because users often inhale the unfiltered smoke deeply and then hold it in their lungs as long as possible, marijuana is damaging to the lungs and pulmonary system. Marijuana smoke contains more cancer-causing agents than tobacco smoke.
Long-term users of marijuana may develop tolerance levels requiring more and more marijuana to achieve the same “high”. Prolonged use leads to dependence, and the drug can become the center of users’ lives.
THC also is contained in a prescription medication called Marinol that is prescribed for cancer patients who are suffering from severe nausea and loss of appetite. Some states have passed propositions to consider marijuana a medication that can be used with a physician’s recommendation