You are from Britain, so I shall forgive you Swoop.
Why in the world would you ever smoke tobacco with pot? Roll a joint, use rolling papers.. no tobacky in the equation.. just the wacky tobacky.
A blunt, using a cigar leaf, would have tobacco in it.
And, I'm talking about filtered smokes, not un-filtered smokes. Un-filtered smokes have way more toxins/carcinogens than filtered.
However, this is a joint. The toxins/carcinogens are slightly less with a bowl, and much less if filtered using a water bong.
-SW