Well, in point of fact, when I started each of the threads I intentionally separated the smoking from that of drugs AND alcohol, by labeling the latter two together as "substance-using", which is broad enough a term to include enhancement drugs - i.e. steroids.

That tobacco and alcohol are legal, while the others are not (to varying degrees) never was an issue in my mind for compartmentalizing them.  That there is a certain fanatical (health uber allus) segment of (western) society busily at work to make tobacco use near as to illegal as can be, well, you could say that it also falls into a gray area of what's "legal", too.

Sorry I'm late to the party on this one.  Anyhow...

On drugs, well I HAD done this before in my fanfic China Will Grow Larger:  I had minor bad guy Lao Zi Bom smoking "special flowers" from his General's hookah.  Later he was quite stoned.

On that toke-n, I have to concur that I do include it, but it's strictly for the bad guys. I have to jump on the "straight-edge hero/Users Are Losers" bandwagon.

Although... I had toyed with the idea of a possible story where a weaker female tries an experimental super-substance/"gear" that grants her grand strength... but ultimately she's caught in the classic struggle between keeping her new power or her soul.

This is a very interesting question.

I think that the general consensus falls under two categories:

1. The group who would include substance abusing characters were they not writing a FM story to enhance the plot and tell a better story
or
2. The group who believe their FM characters are role models, and do not want them to be tainted.  They will however allow villains to abuse substance.

Now, what I find so interesting about this topic is that it raises the question of 'Are you writing your story to tell a story, or satisfy an urge?'.  Don't get me wrong, I'm not criticizing any works at all, but many FM stories are blatantly written to satisfy a fetish.  I have nothing against this, and personally enjoy them as well as those with more developed plots. 

Only a few authors try to tell a story beyond that of muscle growth, female dominance, and sex.  These stories are written for fulfilling a fantasy, and as stated in this thread by some, and frankly, one's fantasy girl often times won't be riddled with substance problems.

Perhaps a story daring to go beyond pleasure, and include a main character riddled with troubles, substance included, would be a good read.  However, I am not so sure of how easily this could relate into a (for lack of a better term) sexy fantasy.

On one last quick question to the writers while they're here:

Those of you who say they view FM characters as role models for children, why exactly is this a factor?  If I am not mistaken, many of these stories include pornographic material, and are not intended for children to read in the first place.  (Nothing critical, just curious about the mindset of some FM writers)