I'm not incredibly knowledgeable about stimulants, but believe I've heard of people having nerve damage from repeated IV use that seems to cause numbness or tingling. Smoking, though? No.
If the problem persists I can't suggest anything other than seeing a doctor, as I've also read anecdotal reports of numbness on one side of the body being related to a stroke.
I'm nothing close to a doctor so take what I'm saying with many grains of salt. I don't want to alarm you based off of hear-say information.