Their relationship might become a bit rocky. Harry may see Sirius as overbearing, while Sirius sees Harry as being irresponsible. However, if they communicate openly, it could lead to a deeper understanding between them. Sirius could share his own experiences with making bad choices when he was younger, which could make Harry more receptive to his advice.
It could strain their relationship at first. Sirius would be worried and disappointed, and Harry might feel resentful of being caught. But in the long run, it could strengthen their bond as Sirius tries to help Harry get over this bad habit.
Initially, it would create some tension. Harry might pull away from Sirius, feeling like he's being treated like a child. But Sirius, being persistent, would keep trying to reach out. He'd remind Harry of how much he cares about him and how smoking can not only harm his physical health but also his reputation at Hogwarts. Eventually, through all these interactions, their relationship could evolve into one where Harry respects Sirius more for his concern and Sirius respects Harry's growing independence as long as he makes healthy choices.
Sirius might confiscate whatever Harry was smoking. He would then sit Harry down and have a serious conversation about the importance of making good choices. He could also remind Harry of the dangerous magic substances that might be out there that are far worse than normal cigarettes and that he should stay away from any form of harmful substances.
If Sirius hits Harry, it can initially strain their relationship. Harry may feel hurt and confused, especially if he trusts Sirius. It could lead to a period of estrangement.
Well, one possible consequence could be detention. Snape is strict and would likely punish Harry for breaking school rules by smoking. He might make Harry clean the Potions classroom or do some other unpleasant chore.
Well, in that situation, Sirius would be shocked and heartbroken. He might first scold Harry for doing something so dangerous to himself. Then, being the impulsive person he can be, Sirius would probably take Harry to see someone he trusts, like Dumbledore or Madam Pomfrey. He would not let Harry out of his sight until he was sure Harry was okay and not likely to do it again.
It could strengthen their relationship. If Harry handles it well, it shows his maturity and trust in them. They would likely appreciate that and become even closer to him.
He's probably furious. Snape has high standards for student behavior, and smoking is definitely not acceptable in Hogwarts. His face might turn red with anger, and his eyes would narrow as he glares at Harry.
Sirius would be deeply affected. He'd see Harry as a sort of surrogate family, and seeing Harry in such a state would make him feel like he failed in protecting him. He'd do everything he could to make Harry feel better, from getting him medical help to just sitting and talking with him for hours about what's wrong.
There is a fanfiction titled 'Under Sirius' Watch'. In it, Sirius catches Harry and Draco sneaking around the castle at night. This leads to a series of events where Sirius has to decide whether to report them or try to understand what's really going on between the two. The story delves deep into the characters' emotions and the complex relationships within the Hogwarts world.
It could potentially strain the relationship. If Sirius misinterprets the situation, it might create some tension. Harry and Hermione would feel like they need to explain themselves, and Sirius might be a bit standoffish until he gets the real story. For instance, if he thought they were hiding something from him, it could make things a bit rocky between them for a while.
It can strain their relationship. If the argument is really intense, they might not trust each other as much immediately afterwards. For example, Harry might start to question Sirius' motives and Sirius could feel that Harry doesn't respect his experience.