I want to order some herbal smoking products online with my debit card but im not 18?

My mom is on my checking account with the debit card but my name is on the debit card. I like to relax and smoke some legal herbal smoking products recreationally on weekends but you have to be 18 to buy it online will they check and how will they know. Will I have to sign for the package?|||They probably will ask, but there's no way to prove your age online. You don't mind that your mom will see the transaction on the bank statement?