On further question what is the prosecution if a small amount of smoke is found when travelling into France ?

a) would i lose my flight from uk ? or just have the smoke confiscated etc and receive a fine/warning/black mark on passport etc..

b) arriving in france, would they detain me for a while, fine me, warn me, send me back on next flight ?

I have no idea of the laws on this for small amount of possesion.