PLEASE!,does it make a difference if the leaves smell like weed, or tomato plants?

I HAVE TWO PLANTS THAT ARE BOUT 2 MONTHS OLD AND WHEN I RUB THE LEAVES AND SMELL MY FINGERS I GET A VERY FAINT WEED SMELL. I ALSO GOT 2, ONE AND A 1/2 MONTH ODLS THAT SMELL LIKE HEAVEN (SUPER STRONG!) COULD THIS INDICATE SEX, OR JUST POTENCY?
oHH! AN ADDITIONAL THOUGHT, ALL 4 ARE PRE FLOWER. I AM NOT QUITE SURE HOW TO DO THE 12/12? DO I PUT THEM IN DARK FOR LONG TIME FIRST? pLEASE SOME HELP, MY FIRST TIME!!!!!!

Just change your light to 12 hours of light 12 hours of COMPLETE dark no interuptions.

No the smell does not matter LOL!!!!!!

no, I just mean that compared to the other two, the larger ones were weak smelling

a lot of times the females will have some stink when they are pre flower, like say you had some seeds that were all the same, if some smelled dank and others smelled like tomatos then usually its the smelly ones that turn female, this is not fool proof so dont use it for determining which ones to keep