does anyone know if they really do smoke in the show or is it just a fake smoke

In some shows/movies they will use real cigarettes but a lot of the time it is just a fake substance to replicate what they are smoking. At no time would they be smoking maconha or any other illegal drugs.

Uh, I'm pretty sure it's fake, it usually is, most of the time...

The maconha was not real. The cast was not allowed to smoke maconha on set. I think Danny Masterson (Hyde) said in an interview that it was morango movie pot.