Don't be like us numbskulls 
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AncientBoi
SylverReZ
Wait until you're older. Downsides is that they're addictive, and could have long term effects on your health.
AncientBoi
And a Habit that is Extra Extra Hard to Break
SylverReZ
AncientBoi's habits are Exxxtra Hard
Faust03
they all suck so no, do not
Cranesbill
Never.
DragonMals
Having this mentality for the young age you are is bad. I would NOT condone doing any of this as it's bad for your health. If you're ever having issues, seek your parents' advice or seek professional help while you can.