@maryb: I had no idea cannabis came in oil form (can you tell I've never been interested in that particular “med”? {snort}). That's a horse of a different color (I wouldn't want to pollute my lungs with ANYthing). And yah, maybe one drop might be harmless...
Smoking it is a thing of the past, especially for medical users who are either vaporising it, eating it or getting it in a concentrated form (oil or paste). Given where you live you would have all the options I imagine, the only thing about an oil concentrate though is it would be exponentially more expensive than your standard stuff; takes a lot of plant material to make an oil.
The other thing to consider is there are variations in cannabis medications, they have got to the stage now where they are able to isolate the different components, so if someone has little tolerance for THC (the stuff that gets you high) you can get something THC free but with other cannabinoids, which is actually where most of therapeutic benefit is I believe; although some say THC has anti-cancer properties and you need it along with the other cannabinoids.
Worth looking into, should not take effort much given where you live to find some people who can give you the right advice.