I'm not quoting the Daily Mail, I'm quoting the British Lung Foundation and you're quoting the British Medical Journal.
Do you think those publications are just "rubbish"? If you multiple those 30,000 by 3.2 mil figures I think you'll find they come out pretty near to the 120,000 figure for 13 million smokers.
I'm also not entirely convinced that marijuana use has increased that much. Yes, it's more out in the open since the 1960s, but remember those places like opium dens back in the Victorian days? I bet plenty of people back then were also using, just nobody did it out in the open like nowadays.
I agree that it does have it's medical uses and yes they should be investigated. Many medicines have come from plants and I think we really ought to be using more plant based medicines than their chemical clones. Probably couldn't grow enough to keep the pharma companies happy though.
And for your info, frankly it wouldn't bother me if they banned smoking and alcoholic drinks either. I like the occasional tipple, but I've never smoked in my life. I can live without them - can you do the same with marijuana?