Marijuana smoke is the only danger to one’s health that I’ve come across. The best way to avoid this harmful side effect is to eat magic brownies.
Have you ever thought about what your actually doing while smoking? You are lighting plant matter and paper on fire. Then you hold the fire close to you and stick it right in front of your face. You are also inhaling solid and liquid particulates and a list of harmful gasses from the paper and plant as you bask in the smoke cloud.
Marijuana smoke poses the same health risks as tobacco smoke, a forest fire, any smoke.
First hand marijuana smoke has been found to cause damage to the respiratory system. It can cause things like bronchitis and respiratory infections. Second hand smoke exposure can be harmful to the blood vessels.
The marijuana smoke contains chemicals that can lead to cancer but no long term research has been done yet.