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We study the weak gravitational lensing effects caused by a stochasticdistribution of dark matter halos. We develop a simple approach to calculatethe magnification probability distribution function which allows us to easilycompute the magnitude bias and dispersion for an arbitrary data sample and agiven universe model. As an application we consider the effects of single-masslarge-scale cosmic inhomogeneities to the SNe magnitude-redshift relation, andconclude that such structures could bias the PDF enough to affect theextraction of cosmological parameters from the limited size of present-day SNedata samples. We also release turboGL, a simple and very fast (<= 1s)Mathematica code based on the method here presented.

A new stochastic approach to cumulative weak lensing