At 18 youre mature enough to choose to die for your country in a war, but not mature enough to use a plant? At 16 you're mature enough to operate a multi ton metal death machine at high speeds around other humans in multi ton metal death machines, but not mature enough to consume a plant? Old enough to marry and create and birth another human being at 18, but not mature enough to use a plant? At 18 we are mature enough to buy and own guns without parental supervision, but not mature enough to use a plant? Ffs, children as young as 4 in this country use guns. I'm tired of this sliding scale BS.
For the record I started smoking when I was 18. Most of my friends started between 13 and 15.