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So drinking casually won't affect your motor skills at all, but smoking a week ago will? Do you know what alcohol is? It's poison for your brain. I like drinking, but that's what it is man. Drinking casually won't affect your motor skills significantly just like smoking casually won't affect your motor skills significantly. And do you really think that because the department of health says it, it's automatically true? Fifty years ago the dep. of health was denying that smoking cigarettes led to lung cancer and it was studies like this one on weed that changed the opinion of the scientific community.
And, i'm not really sure what you mean by "it doesn't matter what they find in their system" because if you actually mean that statisitic you posted is irrelevant, then you're just an idiot with no credibility at all.