Smoking's cool when you're 15. But so is drinking cider in car parks, making DIY fireworks and vandalising phoneboxes.
If you're still smoking past 30, you're basically admitting that you think Humphrey Bogart was 'cool'. Which isn't very cool. Still if you're going to do it, for God's sake stick to fags and not those strawberry-scented vape tubes. Most stupid thing I ever saw a few years ago was two kids kicking off at each other in Camden and, between threats, one of them drawing on his vape.