How can I quit smoking without my mum finding out?

I’m 16 years old and I want to quit smoking without my mum finding out. I looked into getting a quit kit from the NHS but they seem to come in envelopes with QUIT KIT written on them so that would be really obvious. I tried to quit before just on will power but it’s really difficult so I was hoping to get the nicotine patches you can get, but I can’t go out to get any because I’m grounded for an unrelated reason.

Help me please