Vancouver Victoria, BC are blaming the city's bike-theft epidemic in part on the need for crystal meth addicts to do repetitious, menial manual tasks while tweaking (I'm not sure why they don't just assume that tweakers steal bikes and chop them up for parts to raise more money to buy more meth, though):
"We've come across lots of sites littered with bikes and bike parts," Const. Peter Lane said.Link (Thanks, Luckya!)
"They sit in the bush with hundreds of parts just fiddling with them all day..."
"For some reason, they find fiddling with bike parts satisfies that need for stimulation," Lane said