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1.
The first excuse for parents to think weed is bad. The truth is, however, that weed promotes brain cell growth by increasing the development of stem cells in the brain.
Smoking weed kills your brain cells! That's why you only have straight A minuses!
by SomethingCool51 July 25, 2012
 
2.
The cells found in your brain.
aka: what you lose after smoking weed.
Going out to kill some more brain cells.
by BrittanySmith:) July 27, 2007
 
3.
Useless matter. More useful when replaced with air.
Fuck brain cells, I'm gonna smoke a bowl.
by drgreenthumb January 04, 2008