I don't think John Mayer is saying he wants to smoke pot. All he is saying is that who is to say I can't do anything. Don't matter if it is legal or illegal. It might rub people the wrong way just cuz of da reference to getting stoned. People only judge the outside of a song rather than the true meaning. In some way songs are like people an people are like books. An everyone know you can't judge a book by its cover. Love the song. Keep making good music!