The cannabinoid system controls digestion, hunger, reproduction of muscle fibres, skin cells, brain cells and neurons, metabolism, lipid production in the liver, glucose levels, insulin rejection, nutrient delivery, pain detection and regulation of other neurotransmitters.
What all of this basically means is that when you smoke weed it balances your chemicals, makes you hungry, helps you digest food better, gets nutrients to your cells better, dilates your arteries, tells the body to make new neurons, brain cells, skin cells and muscle fibres, increases good cholesterol lowers bad cholesterol reduces insulin rejection, balances glucose levels, fills out your cells, gives you a greater pain tolerance and helps you sleep better which increases human growth hormone levels, opens up your airways and helps you breath better. And, if smoked sparingly, gives you more energy.
This disproves the theory that marijuana is bad for you and has horrible consequences on the body and makes you lazy. It is not weed that makes you lazy and lack judgement, it is stupid and lazy people that smoke too much weed that blame their laziness and poor judgement on weed. Psychologists call this "externalizing blame".
http://www.asylum.com/2010/06/02/university-of-iowa-marijuana-pot-herb-doesnt-impair-driving-ability/http://onlinepot.org/medical/positivepot.htm Effects on the Heart
Marijuana increases heart rate by 20-100 percent shortly after smoking; this effect can last up to 3 hours. In one study, it was estimated that marijuana users have a 4.8-fold increase in the risk of heart attack in the first hour after smoking the drug.5 This may be due to increased heart rate as well as the effects of marijuana on heart rhythms, causing palpitations and arrhythmias. This risk may be greater in aging populations or in those with cardiac vulnerabilities.
Effects on the Lungs
Numerous studies have shown marijuana smoke to contain carcinogens and to be an irritant to the lungs. In fact, marijuana smoke contains 50-70 percent more carcinogenic hydrocarbons than tobacco smoke. Marijuana users usually inhale more deeply and hold their breath longer than tobacco smokers do, which further increase the lungs' exposure to carcinogenic smoke. Marijuana smokers show dysregulated growth of epithelial cells in their lung tissue, which could lead to cancer;6 however, a recent case-controlled study found no positive associations between marijuana use and lung, upper respiratory, or upper digestive tract cancers.7 Thus, the link between marijuana smoking and these cancers remains unsubstantiated at this time.
Nonetheless, marijuana smokers can have many of the same respiratory problems as tobacco smokers, such as daily cough and phlegm production, more frequent acute chest illness, and a heightened risk of lung infections. A study of 450 individuals found that people who smoke marijuana frequently but do not smoke tobacco have more health problems and miss more days of work than nonsmokers.8 Many of the extra sick days among the marijuana smokers in the study were for respiratory illnesses.
Effects on Daily Life
Research clearly demonstrates that marijuana has the potential to cause problems in daily life or make a person's existing problems worse. In one study, heavy marijuana abusers reported that the drug impaired several important measures of life achievement, including physical and mental health, cognitive abilities, social life, and career status.9 Several studies associate workers' marijuana smoking with increased absences, tardiness, accidents, workers' compensation claims, and job turnover.
Some say that marijuana should be legalized for medical use because it has been known to suppress nausea, relieve eye pressure, decrease muscle spasms, stimulate appetite, stop convulsions and eliminate menstrual pain. Because of its therapeutic nature, marijuana has been used in the treatment of several conditions including: cancer and AIDS (to supress nausea and stimulate appetite), glaucoma (to alleviate eye pressure), epilepsy (to stop convulsions) and multiple sclerosis (to decrease muscle spasms).
The positive effect findings from my first source were fairly typical for what one may have heard about the drug. Some of which being: feeling relaxed, feeling happy, getting munchies (could also be considered negative), increased enjoyment of music and art, more appreciation of the surroundings, forgetting cares and worries, better imagination and visualization, increased creativity, as well as more enjoyment of sexual activity and increased feelings of excitement (Hammersley, R, & Leon, V. 2006).