Obviously there can be side effects from cannabis products and not everyone gets on with them, if you buy it legally then there'd be more choice of variety depending on why you wanted to take it, anything from a particular medical benefit to the equivalent of a couple of beers to relax. The government could also tax it and get an income stream from it, or allow people to grow up to a certain amount, it would free up a lot of police time too.
I think the law in this country with regards to drugs in general and cannabis in particular is ridiculous and out dated and in desperate need of reform.
But this thread was just a funny about chickens being given weed and the benefits to them and potentially to all of us if they need fewer anti-biotics, anti-biotic resistant germs are an increasing problem and a lot of its due to over use.