“The most common kind of clove cigarettes contains 40 percent shredded clove buds and 60 percent tobacco. The major component of clove buds is eugenol, a substance that can promote lung infections and provoke asthma attacks. The amount of nicotine in a clove cigarette is less than that in a regular cigarette, but there’s enough nicotine to do the damage for which it has earned it’s well deserved, abominable reputation.

Source: Dr. Paul Donohue Senior Observer Canada 1998