The half-life of an active substance is the time required by a healthy body, with no previous drug use, to eliminate 50% of the absorbed substance. In the case of cannabis, the half-life is 96 hours or 4 days. This means that within 4 days the body has eliminated 50% of the initial dose. 4 days later, there will be 25% of the product left… Within 28 days, cannabis will be totally eliminated from the body of a person who has not consumed it regularly. Traces of decayed THC may be found in a regular consumer’s body up to 40 days after the last take. According to Dr Chamayou’s thesis, 18 months are needed to be completely cleared of cannabis.

AEROSOLS Nitrous oxide and other pressurized gases such as those contained in whipped cream canisters or computer anti-dust sprays also have hallucinogenic effects. In a few seconds they produce excitement, dizziness, euphoria, loss of consciousness and affect the central nervous system through lack of oxygen. Moreover they are inhaled under pressure and can provoke lung frostbite and vocal chords injuries, (eg. immediately after taking this drug the voice becomes lower.)

POPPERS Volatile nitrites have similar effects to nitrous oxide. Moreover they can provoke panic attacks, heart palpitations and headaches. They are also responsible for deaths by anoxia. They are vasodilators frequently used to relax sphincter muscles. They are carcinogenic and provoke serious immune deficiencies – such as AIDS.

STAIN REMOVER Stain removers are derived from ethylene. They are hallucinogenic but their effect is more calming, unlike poppers and aerosols, which are more stimulating. They cause damage that is neurological (deafness, tremor) and intellectual (dementia).

A joint is made out of pure cannabis or grass; or hashish mixed with tobacco.
Alcohol is a general term, which covers a wide variety of products:
wine, cider, beer, port, cognac, whisky, vodka are types of alcohol with various rates of alcoholic content ranging from 5 to 90 ° (active principles)
Cannabis works the same way: but when we talk about a joint of grass or hashish, there are more than 100 varieties and its T.H.C. rate (active principles) –ranges from 4% to 35% - goes unnoted.alcools aux taux variés de 5 à 90 degrés ( principes actifs)

Any psychotropic drug, be it legal - anxiolytic, tranquillizer, benzodiazepine, neuroleptic - or illegal - street drugs - leads to ill-being, depression and to suicide. See table with side effects of psychotropic drugs – Technical Information/Classification .