I think tobacco is MUCH worse than heroin to kick...'nuff said...
Let's just beta-test this notion:
Take a group of smokers (and I ain't alking about 3-4 a day types; I mean ones like me who go thru 3 bic lighters a WEEK!!

) and a group of smack freaks, and put 'em in a large room.) Each gets a fix, and now we wait...
60 minutes later: the smack freaks are nodding, well-behaved, (urk! it appears some may have OD'ed; well, you can't get any more well behaved than that...)
The tobacco freaks are wild-eyed, and fighting over the last 1/2" butt..
3 days later, the smack freaks are beginning to rouse from 'cold turkey'; they are requesting food, and their color is coming back.
Meanwhile, the smokers are planning insurrection, threatening to takes hostages, and generally climbing the walls. They have tried to roll and ignite the smoking patches.
Their re-integration into society looks far more doubtful than the heroin addicts, who are being led out of the testing area for their own safety...