they started putting filters on cigarettes in the 1960s.
when did they start putting filters on cigarettes?
the 1960s
parliament (cigarette)









































parliament is an american brand of cigarettes, currently owned and manufactured by philip morris usa in the united states and philip morris international outside of the united states.









































section::::history.









































the brand was launched in 1931 and is distinctive for its recessed paper filters. it was originally used as an advertising gimmick when cigarettes did not have filters. the first commercial cigarette filters came into use in 1935.
parliament (cigarette)
cigarette filters contain the chemicals filtered from cigarettes and can leach into waterways and water supplies. the toxicity of used cigarette filters depends on the specific tobacco blend and additives used by the cigarette companies. after a cigarette is smoked, the filter retains some of the chemicals, and some of which are considered carcinogenic. when studying the environmental impact of cigarette filters, the various chemicals that can be found in cigarette filters are not studied individually, due to its complexity. researchers instead focus on the whole cigarette filter and its ld. ld is defined as the lethal dose that kills 50% of a sample population. this allows for a simpler study of the toxicity of cigarettes filters. one recent study has looked at the toxicity of smoked cigarette filters (smoked filter + tobacco), smoked cigarette filters (no tobacco), and unsmoked cigarette filters (no tobacco). the results of the study showed that for the ldof both marine topsmelt ("atherinops affinis") and freshwater fathead minnow ("pimephales promelas"), smoked cigarette filters + tobacco are more toxic than smoked cigarette filters, but both are severely more toxic than unsmoked cigarette filters.
cigarette