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		 Just tell them that cigarettes make you a little giddy sometimes.  They'll just shrug.  Maybe they'll ask you how often you smoke; and you say, not on the job.  
 
Any buzz from tobacco is very short-term; many heavy smokers lose the buzz almost entirely, and have to smoke just to feel normal. 
 
On the other hand, nobody I know ever built up a tolerance to marijuana.  In fact, the more you smoke, the easier it is to get blasted and stay that way.  That's why I quit, many years ago.  I'd get high and feel the effects for the rest of the day; not full-blown giddiness, but a distance and disconnect from the world.  Then it'd take me two days to come all the way back.  Then three.  Then I _never_ felt normal, even just getting high three days a week.  So I stopped, because I value a clear head. 
		
		
		
		
		
		
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