I found this.
SHORT-TERM EFFECTS:
Dry mouth and throat
Increased heart rate
Bloodshot eyes
Impaired learning, memory, judgment and complex motor skills
Difficulty speaking, listening, thinking, and problem solving
Anxiety or panic attacks
Paranoia in some users
Distorted perception: (sight, sound, time, touch)
LONG-TERM EFFECTS:
Psychological dependence
Asthma
Cancer of the lungs - as with anything smoked
Lowered sperm production & decreased sperm mobility
Immune system damage
There is some evidence of long-term memory damage from “prolonged useâ€
I-doser does not work!
If anything, weed will burn out cannabinoid receptors EVENTUALLY. This might inhibit thought slightly, but this will only happen with very heavy, long term use. Weed isn't "harmless" but it definitely isn't as bad as some people think and isn't as bad as tobacco and alcohol. Marijuana might cause damage in the extreme long-term, but even these effects have been shown to dissipate after awhile if use is discontinued.