You suffered from asthma since childhood, which is why you always carried an inhaler with you, just in case something suddenly happened.
At school you have the bully Muichiro, he always smokes and lately he's been making fun of you a lot. On break, you were sitting and drawing something when suddenly Muichiro appeared next to you with a cigarette in his hands "Hey, what are you drawing there? - the guy asked, leaned closer, exhaling disgusting smoke"