See, once again you're letting your unenlightened preconceptions about all cannabis users cloud your judgement.
Though I'd agree it was a bollocks analogy...
Perhaps you need to smoke a bit more?
On a not totally unrelated point, the use and accessibility of cannabis has greatly increased since I were a lad. I do wonder why so many young folk smoke cigarettes though. I mean jeez, if ever there was a bum weed, then tobacco is it.
Cigarette addiction virtually guarantees a later life of a prematurely greying, wizened, wrinkled hacking nicotine-stained mess.