There are several possible ways she could have found out:
Observation: Parents can often be observant and notice changes in their child's behavior, such as the smell of smoke on their clothes or breath, finding cigarette butts or lighters, or witnessing other telltale signs.
Friends or Family: Sometimes, friends or family members might accidentally reveal your secret, either by mentioning it directly or indirectly.
Social Media: If you have shared any content related to smoking on social media or have friends who did, your mom might have come across it.
Phone or Internet Activity: Parents might check their child's phone or internet activity, which could lead them to discover smoking-related content or communication.
School or Teachers: It's possible that someone at school, like a teacher or staff member, noticed signs of smoking and informed your mom.
Anonymous Tip: Someone who knows about your habit might have anonymously informed your mom.
Regardless of how she found out, it's essential to remember that your mom's reaction might have been out of concern for your health and well-being. Smoking can have severe health consequences, especially for young people. Having an open and honest conversation with your mom about your feelings and concerns could help you both understand each other better. Remember, parents often want what's best for their children and might be more understanding than you expect.