Re: A thematic question regarding Life Support (Disease) and (Poisons)
RE: The discussion above regarding how much of cigarette addiction is "in your head"...
I quit smoking a few years back, and when I was input to the V.A. outpatient mental health clinic, I had to sit in on a substance abuse therapy group so they could determine that my depression and anxiety problems weren't the result of an addictive lifestyle. Several of my classmates were recovering from cocaine and/or heroin addiction. More than a few admitted that quitting cigarettes was harder than quitting their drug of choice. Just because something's "all in your head" doesn't mean it isn't as serious as something that has a wholly outside cause.[/soapbox]
There're a few ways to handle this, and Hero is flexible enough to do it whatever way the player wants:
LS negates both positive and negative aspects of the protected substance. He drinks, and if he doesn't like the flavor, he may quit with little or no difficulty.
LS Negates all negative effects, but "entertaining" aspects of the substance are fully experienced.
LS protects the player from long-lasting harm, but he will feel all non-fatal effects of the substance.
Some other thing that wasn't the previous three.
What disadvantage you use to reflect the difference between fully-effective and the low-rent versions depends on how often the GM expects the character to come in contact with the substances in question, and the player, too of course. Of course, if the GM doesn't want to expose anyone to disease or poisons, he can just tell the player not to buy the power, but if he really wants it why not? Unless you were counting on all your heroes being K.O.-ed by the villain's sleep-gas or plague-spray, I see no problem letting a super-hero have that particular superpower.
If you argue that someone with "Immunity to poisons" can't appreciate the taste of brown liquor or a fine tobacco, I'd say you're wrong. Maybe he just enjoys everyone else's reaction to his stinky cigar? Or maybe, to him it doesn't stink? When diluted with water, many hard drinks "bloom", giving off more aromatic chemicals and flavors, as well as reducing some of the less-pleasant effects, or at least delaying them.