Most people smoke the plant's dried leaves, flowers, stems, and seeds. But marijuana can also be mixed into food (like brownies, cookies, and lollipops), brewed as a tea, or inhaled with a vaporizer.
No matter how it gets into your system, it affects almost every organ in your body, and your nervous system and immune system, too. When you smoke pot, your body absorbs THC right away. (If you eat a baked good or another item, it may take much longer for your body to absorb THC, because it has to break down in your stomach before it enters your bloodstream). You may notice changes in your body right after you smoke. The effects usually stop after 3 or 4 hours.
Smoking pot can increase your heart rate by as much as two times for up to 3 hours. That’s why some people have a heart attack right after they use marijuana. It can increase bleeding, lower blood pressure, and affect your blood sugar, too.
We don’t yet know if marijuana is linked to higher odds of getting lung cancer. But the process does irritate your lungs -- which is why regular pot smokers are more likely to have an ongoing cough and to have lung-related health problems like chest colds and lung infections.
Other physical effects of marijuana include:
- Shallow breathing
- Red eyes and dilated pupils
- Dry Mouth
- Increased appetite
- Slowed reaction time (If you drive after using marijuana, your risk of being in a car accident more than doubles.)
Changes to Mind and Mood
Smoking pot can also have less-pleasant effects on your mind and mood, too. You might have:
- A distorted sense of time
- Random thinking
- Short-term forgetfulness
The amount of THC in marijuana has gone up in recent years. Most leaves used to contain between 1% and 4% THC. Now most have closer to 7%. Experts worry this might make it easier to become dependent on or addicted to marijuana -- and it also strengthens many of the drug’s mind-altering effects.
Even if you buy from a legal, state-regulated dispensary, it can be hard to know exactly how much THC or other compounds found in marijuana you’re ingesting, so the effects can be unpredictable.
Marijuana can also cause more health problems if you have a condition like liver disease, low blood pressure, or diabetes.
If you’re a man, heavy use could lower your testosterone levels, and your sperm count and quality. That, in turn, can zap your libido and fertility.
Research shows a link between marijuana use and mental health problems like depression, anxiety, suicidal thoughts, short-term , psychosis and schizophrenia. While it’s not clear if marijuana causes these conditions, it can make them worse.