yes, it is true, but substitution is not the best way to go.
cannabis is not physically addicting but the habit of regular use can be, just like anything else can be if one does it routinely. take your head to another place...hanging at a pot site won't help much if you're serious about stopping. i've always found nature to be the perfect getaway for the brain...also road trips help.

ron (this site's owner) also runs a 'help' site that's full of people recovering from all sorts of addictions and would be more helpful to you...they'll have some suggestions for you: http://drugabusehelp.com/

good luck