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| Drug Influence Researches |  The researches, which compared the adults who smoked both marijuana and tobacco with those who smoked only tobacco showed that marijuana using increase difficulty in trying to quit smoking tobacco. The relationship between marijuana use and continued smoking was particularly strong in those who smoked marijuana daily at the time of the initial interview, 13 years prior to the follow up interview.
Even using marijuana occasionally can cause burning and stinging of the mouth and throat, often accompanied by a heavy cough.
Those who smoke marijuana regularly may have many respiratory problems like tobacco smokers’ problems such as daily cough and phlegm production, heightened risk of lung infections, frequent acute chest illnesses and a greater tendency toward obstructed airways.
Marijuana smoke may cause the cancer of the respiratory tract and lungs. A study compared 173 cancer patients with 176 healthy individuals produced strong evidence that smoking marijuana increases the likelihood of developing cancer of the head or neck, and that the more marijuana smoked, the greater the increase. For the research data, marijuana smoking doubled or tripled the risk of the cancers.
It is harder to graduate from high school for students who smoke marijuana than for their nonsmoking peers. One of the researchers shows that marijuana smokers have problems with verbal and mathematical skills. Although all of the students had scored equally well in 4th grade, the smokers' scores were significantly lower in 12th grade than the nonsmokers' scores were.
Workers who smoke marijuana very often have problems on their jobs.
Several studies have associated workers' marijuana smoking with increased absences, tardiness, accidents, workers' compensation claims, and job turnover. A study among municipal workers found that employees who smoked marijuana on or off the job reported more "withdrawal behaviors" - such as leaving work without permission, daydreaming, spending work time on personal matters, and shirking tasks - that adversely affect productivity and morale.
Depression, anxiety and personality disturbances are all associated with marijuana use. Research clearly demonstrates that marijuana use has the potential to cause problems in daily life or make a person's existing problems worse. Because marijuana compromises the ability to learn and remember information, the more a person uses marijuana the more he or she is likely to fall behind in accumulating intellectual, job or social skills. Moreover, research has shown that marijuana's adverse impact on memory and learning can last for days or weeks after the acute effects of the drug wear off.
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