420 is a numerological thing as many have suspected: (A=1, B=2, ... , Z=26)
C = (C for Cannabis) = 3
M = (M for
Marijuana) = 13
G = (G for Ganga) = 7
W = (W for Weed) = 23
S = (S for Sensimilia) = 19
Weed + Sensimilia = 42;
Cannabis + Ganga =
10;
42 x
10 = 420