If you want your nose to burn and potentially bleed, go ahead. However, it is very rare that someone reports any increase in effectiveness when Adderall, Ritalin, or similar drugs are snorted.
The above answer is incorrect. I am prescribed 37 MG of Concerta, and personally I have snorted it. Unlike most ADHD drugs, Concerta is a time release pill. If you take the plastic covering off of it (at least on a 37 mg) You will see the pill is in 2 halves. One half is brown and one is white / yellow. The brown part is an actual sponge that pushes the drug out the other end over time as it dissolves in your stomach. If taken orally without taking the black part off, it lasts all day. If taken without the black part it is much more powerful, but lasts shorter.
To snort it:
Discard the brown part, take a boxcutter or whatever and peel another plastic layer off the top of the yellow / white part. Then crush it up real fine and snort up :_)