Is probably something like this:
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<br />These work by blowing hot air through in this case a plant/weed, but not hot enough for smoke to form.
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<br />From your post I don't understand who has CF and if they've been inhaling through it themselves, but being nearby really wouldn't hurt. Ofcourse weed itself when not consumed through smoking, and not consumed all day every day doesn't hurt either, also not when you have CF.
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<br />Btw. I don't use or like to use myself, I wish to spend the hours that I am awake and able to do stuff focussed instead, but I'm Dutch (is more or less legal here) and we know these things. Even stopped my occasional (once a week or less) use of alcohol as well as I notice positive effects on my body.
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<br />PS. But to go offtopic somewhat: That is true for pretty much any drug, when used in moderation they are not so harmful. And then those that are (fe. alcohol) are not even categorised as harddrug which it is. There is a whole lot of misinformation on drugs, mostly spread to make people fear specific types of drugs in favour of a specific agenda. And the problems resulting from this fear are far greater than the drugs itself. (pushing it into criminality, lack of finances to educate on druguse itself and to help those that do experience problems with it, because it's being spent on a "war on drugs" instead which results in thousants upon thousants of dead itself.)
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<br />To give some curious facts, let's say you want to become an addict...it takes about a month of injecting something like heroin twice a day before your body becomes somewhat dependant, so it takes dedication.. <img src="i/expressions/face-icon-small-confused.gif" border="0">
<br />Then to stop using them once addicted, "cold turkey", is nothing more than a mild flu, not the weeks of painful shaking and screaming it's often amde out to be. Relative to CF'ers they are a bunch of pussies.
<br />The research is being done on this, but if you want to do this or publish this for example in America, you will be stopped from doing so.
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<br />One example is the initial tests in America when they wanted to demonstrate how bad drugs really were back then, through rat-tests. So a bunch of rats and everything you could possibly get addicted to in a cage. Ok, so 4-6 weeks, every rat addicted, couple months later, all rats dead because they wouldn't eat anymore etc. "see how bad drugs are!" That's around the time when the war on drugs started. (in the 70's) Then there was a man who realised, no wait a minute, the rats have no choice, if you put me in a room filled with cocaine eventually i'd start using it. So what he did was get a bunch of rats addicted again, then 4-6 weeks later put them in a very pleasant enviroment instead. A rat paradise. Cool playgrounds, great food, presumeably posters of barely dressed rats on the wall things like that. The substances still there, but what happened, the addicted rats stopped continuous use. Sure, they'd use some once in a while (presumeably on the weekends when chillin' with their buddies) but not all the time and they weren't addicted anymore. They'd eat well, happy rats with nice lives.
<br />Conclusion, an addict isn't unhappy because he uses drugs, an addict uses drugs BECAUSE he is unhappy. Where could we best spend the money then?
<br />This is just one example of a study that has been blocked from publishing in America and is just one of many.
Good luck!